Astronomy Final Test 2
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Which of the following objects in NOT rotating around its own axis?
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Earth
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Mars
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Jupiter
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Uranaus
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None of the above (they all rotate around there own axes)
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Astronomy Final Test 2 explores key concepts in planetary science, including rotation, solar system formation, and seasonal changes on Jovian planets. This quiz assesses understanding of theoretical and observational aspects of astronomy.
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- 2.
Why are all the large bodies in the Solar System round
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Rotation speeds pull the planetary material into a spherical shape
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The process of differentiation produces spherical shells of material
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Friction from the accretion process
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Gravity pulls the material into a spherical shape
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None of the above
Correct Answer
A. Gravity pulls the material into a spherical shapeExplanation
Gravity is the force that attracts objects towards each other. In the case of large bodies in the Solar System, such as planets and moons, their own gravity pulls the material towards their center of mass. As the material accumulates, it becomes compressed under its own weight, causing it to form a spherical shape. This is because a sphere is the most efficient shape for distributing mass evenly around a central point, minimizing gravitational potential energy. Therefore, gravity is the main factor responsible for shaping the large bodies in the Solar System into round shapes.Rate this question:
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- 3.
According to our theory of solar system formation, why did Uranus and Neptune end up to be much less massive than Jupiter and Saturn?
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Particles in the solar nebula were more spread out at greater distances, so that accretion took longer and there was less time to pull in gas before the solar wind cleared the nebula
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The size differences are thought to be a random coincidence
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Ices were able to condense at the distance of Jupiter and Saturn, but only rock and metal could condense at the distances of Uranus and Neptune
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The colder gas in the outer regions of the solar nebula has less gravity and therefore could not gather up into such large balls
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None of the above
Correct Answer
A. Particles in the solar nebula were more spread out at greater distances, so that accretion took longer and there was less time to pull in gas before the solar wind cleared the nebulaExplanation
According to the theory of solar system formation, the particles in the solar nebula were more spread out at greater distances. This means that the process of accretion, where particles come together to form larger bodies, took longer at these distances. As a result, there was less time for Uranus and Neptune to pull in gas before the solar wind cleared the nebula. This explains why Uranus and Neptune ended up being less massive than Jupiter and Saturn.Rate this question:
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- 4.
Which of the following observations, if made, could NOT be explained by the theory of solar system formation as discussed in class?
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A ninth planet similar in mass and size to Neptune is discovered to out past Pluto
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A ninth planet similar in ass and size to Earth is discovered between Jupiter and Saturn
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A new moon of Saturn is discovered that does not have a single impact carter on its surface
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One of the moons Jupiter is discovered to simply be a a large comet captured by Jupiter's gravity
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None of the above
Correct Answer
A. A ninth planet similar in ass and size to Earth is discovered between Jupiter and SaturnExplanation
The theory of solar system formation suggests that planets form from a protoplanetary disk around a young star. According to this theory, planets form in specific regions of the disk based on their distance from the star and the composition of the materials available. Therefore, the discovery of a ninth planet similar in mass and size to Earth between Jupiter and Saturn would contradict this theory, as it would not align with the expected formation pattern of planets in the solar system.Rate this question:
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- 5.
When energy is transferred by the motion of hot material rising and cooler material sinking, it is called
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Conduction
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Radiation
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Fusion
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Convection
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None of the above
Correct Answer
A. ConvectionExplanation
Convection is the correct answer because it refers to the transfer of energy through the motion of hot material rising and cooler material sinking. In this process, heat is transferred through the bulk movement of the fluid, such as air or water, as it circulates. This mechanism is commonly observed in everyday life, such as in the rising of warm air and the sinking of cool air in a room, or in the circulation of water in a pot when it is heated. Convection plays a crucial role in various natural phenomena, including weather patterns and ocean currents.Rate this question:
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- 6.
Which Jovian planet should have the most extreme seasonal changes
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Jupiter
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Saturn
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Uranus
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Neptune
Correct Answer
A. UranusExplanation
Uranus should have the most extreme seasonal changes among the Jovian planets. This is because Uranus has a unique tilt on its axis, with its north and south poles almost parallel to its orbital plane. As a result, Uranus experiences extremely long and extreme seasons, with each pole being exposed to continuous sunlight or darkness for 42 years at a time. This extreme tilt causes significant variations in temperature and weather patterns, making Uranus the Jovian planet with the most extreme seasonal changes.Rate this question:
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- 7.
What is significant about the motion of all the large bodies in the Solar System?
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They all generally rotate in the same direction
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Their motions appear to be totally random
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They revolve around the Sun in alternating directions
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They do not move at all
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None of the above
Correct Answer
A. They all generally rotate in the same directionExplanation
All the large bodies in the Solar System generally rotate in the same direction. This is significant because it suggests that the Solar System formed from a rotating disk of gas and dust, with the angular momentum of the system causing the bodies to rotate in the same direction. This is known as the conservation of angular momentum and is a fundamental principle in physics.Rate this question:
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- 8.
As the size of a terrestrial planet grows larger, the size of its lithosphere
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Grows smaller at a percentage-wise basis
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Grows larger on a percentage-wise basis
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Is constant
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Becomes a majority of the planet's interior
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None of the above
Correct Answer
A. Grows smaller at a percentage-wise basisExplanation
As the size of a terrestrial planet grows larger, the size of its lithosphere grows smaller at a percentage-wise basis. This means that the proportion of the planet's lithosphere decreases as the planet's overall size increases. This can be attributed to the fact that the lithosphere is the outermost layer of a planet's solid surface, and as the planet grows larger, the ratio of its solid surface area to its overall size decreases. Therefore, the lithosphere becomes a smaller percentage of the planet's interior.Rate this question:
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- 9.
How do the size and mass of Jupiter's core compare to Earth?
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It is about 10 times larger in size and the same mass
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It is the same size and mass
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It is about the same size but 10 times more massive
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It is about 10 times larger in size and mass
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None of the above
Correct Answer
A. It is about the same size but 10 times more massiveExplanation
The correct answer states that Jupiter's core is about the same size as Earth's core but 10 times more massive. This means that while the physical dimensions of the cores may be similar, Jupiter's core has significantly more mass, making it much denser and heavier than Earth's core.Rate this question:
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- 10.
The following statements are all true. Which one counts as an "exception to the rule" in ebing unusual for our Solar System?
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Jupiter has a very small axis tilt
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Saturn has no solid surface
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Venus does not have a moon
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The diameter of Earth's moon is one quarter the size or Earth
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All the above are exceptions
Correct Answer
A. The diameter of Earth's moon is one quarter the size or EarthExplanation
The given answer states that the diameter of Earth's moon being one quarter the size of Earth is an exception to the rule in being unusual for our Solar System. This is because most moons in the Solar System are significantly smaller in comparison to their parent planets, whereas Earth's moon is relatively large in proportion to Earth.Rate this question:
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- 11.
What causes the geological activity on Solar System objects?
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Impacts from leftover planetesimals
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Interior heat
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The objects' magnetic fields
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Gravitational interactions with the Sun
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None of the above
Correct Answer
A. Interior heatExplanation
The geological activity on Solar System objects is caused by interior heat. This heat is generated by various processes such as radioactive decay and the residual heat from the formation of the object. It leads to volcanic activity, tectonic movements, and other geological phenomena. Impacts from leftover planetesimals, the objects' magnetic fields, and gravitational interactions with the Sun may have some effects on the objects, but they are not the primary cause of the geological activity.Rate this question:
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- 12.
Why are there no impact craters on the surface of Io?
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It is too small to have been bombarded by planetesimals in the early Solar System
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Any craters have been eroded by the strong winds on Io's surface
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Jupiter's strong gravity attracted the planetesimals more strongly than Io and thus none landed on Io's surface
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Io did have craters but they have all been buried in lava flows
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Io's thick atmosphere obscures the view of the craters
Correct Answer
A. Io did have craters but they have all been buried in lava flowsExplanation
Io, one of Jupiter's moons, did have craters in the past. However, due to its volcanic activity, lava flows have covered and buried these craters over time. This volcanic activity is a result of tidal forces exerted by Jupiter and its other moons, causing constant eruptions and resurfacing of Io's surface. As a result, the impact craters that were once present on Io's surface are no longer visible.Rate this question:
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- 13.
According to our basic scenario of solar system formation, why do the Jovian planets have numerous large moons?
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The large moons of the jovian planets originally formed in the inner solar system and these moons then migrated out to join up
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As the growing jovian planets captured gas from the solar nebula, the gas formed swirling disks around them, and the moons formed from condensation accretion within these disks.
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Because of their strong gravity, the jovian planets were able to capture numerous asteroids that happened to be passing nearby, and these became the major moons of the jovian planets
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The many moons of the jovian planets remains one of the unexplained mysteries of the formation of our solar system
Correct Answer
A. As the growing jovian planets captured gas from the solar nebula, the gas formed swirling disks around them, and the moons formed from condensation accretion within these disks.Explanation
The correct answer explains that the large moons of the jovian planets formed from condensation accretion within swirling disks of gas that formed around the growing jovian planets as they captured gas from the solar nebula. This explanation suggests that the moons formed in close proximity to the jovian planets and then migrated out to join them. This is in line with our basic scenario of solar system formation.Rate this question:
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- 14.
Which of the following is NOT necessary for a planet to generate a magnetic field?
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An electrically conducting core
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Convection in the interior
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A completely solid core
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Rotation of the core
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None of the above (they are all required)
Correct Answer
A. A completely solid coreExplanation
A completely solid core is not necessary for a planet to generate a magnetic field. This is because a magnetic field is generated by the movement of electrically conducting material in the planet's core. A partially molten or liquid core can still generate a magnetic field as long as there is convection and rotation within the core. Therefore, a completely solid core is not required for the generation of a magnetic field.Rate this question:
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- 15.
Which of the following is NOT a general characteristic of the Jovian planets?
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They are much more massive than the terrestrial planets
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They lack solid surfaces
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They are lower in average density than the terrestrial planets
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They are composed mainly of hydrogen, helium, and hydrogen compounds
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None of the above (they are all general characteristics of the Jovian planets)
Correct Answer
A. None of the above (they are all general characteristics of the Jovian planets)Explanation
The given correct answer states that all of the characteristics listed are general characteristics of the Jovian planets. This means that the Jovian planets are indeed much more massive than the terrestrial planets, they lack solid surfaces, they have lower average density than the terrestrial planets, and they are composed mainly of hydrogen, helium, and hydrogen compounds. Therefore, none of the characteristics listed can be excluded as a general characteristic of the Jovian planets.Rate this question:
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- 16.
Which processes is used to determine the age of the Solar System?
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Radiometric dating
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Measuring the depth of impact craters
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Counting the rings in meteorites
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Astronomers use the time scale given by the current theory of solar system formation
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None of the above
Correct Answer
A. Radiometric datingExplanation
Radiometric dating is the process used to determine the age of the Solar System. This method involves measuring the decay of radioactive isotopes in rocks and minerals to calculate the amount of time that has passed since they formed. By analyzing the ratios of parent and daughter isotopes, scientists can estimate the age of rocks and meteorites, providing valuable insights into the formation and evolution of the Solar System. The other options, such as measuring impact craters or counting rings in meteorites, are not accurate methods for determining the age of the Solar System.Rate this question:
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- 17.
Planetary surfaces changes caused by wind, water, or ice are called?
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Convection
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Differentiation
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Conduction
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Tectonics
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Erosion
Correct Answer
A. ErosionExplanation
Erosion refers to the process of wearing down and reshaping the Earth's surface through the action of wind, water, or ice. This can include the removal of soil, rock, or other materials, resulting in changes to the planetary surface. Convection, differentiation, conduction, and tectonics are not directly related to the physical changes caused by wind, water, or ice, making erosion the correct answer.Rate this question:
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- 18.
What atmospheric constituent is responsible for the blue color of Uranus and Neptune?
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Ammonia
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Methane
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Water
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Hydrogen
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None of the above
Correct Answer
A. MethaneExplanation
Methane is responsible for the blue color of Uranus and Neptune. Methane gas in the atmospheres of these planets absorbs red light and reflects blue light, giving them their distinct blue appearance. This phenomenon is known as Rayleigh scattering, where shorter wavelength light is scattered more efficiently than longer wavelength light. As a result, the blue light is scattered in all directions, making the planets appear blue to observers.Rate this question:
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- 19.
Based on everything we've discussed about solar system formation, which of the following statements is probably NOT true?
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Only a tiny percentage of stars are surrounded by spinning disks of gas during their formation
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Other planetary systems will have far more numerous asteroids and comets than actual planets
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Other solar systems will also have planets in the two basic categories
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Planets always tend to orbit their star in the same direction and approximately the same plane
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None of the above (they are all probably true)
Correct Answer
A. Only a tiny percentage of stars are surrounded by spinning disks of gas during their formationExplanation
Based on everything we've discussed about solar system formation, it is likely that a significant percentage of stars are surrounded by spinning disks of gas during their formation. This is because the formation of planets and other celestial bodies is believed to occur within these disks of gas and dust. Therefore, the statement "Only a tiny percentage of stars are surrounded by spinning disks of gas during their formation" is probably NOT true.Rate this question:
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- 20.
The greenhouse effect occurs because Earth's atmosphere is transparent to
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X-rays
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Ultraviolet light
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Visible light
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Infarared light
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All of the above
Correct Answer
A. Visible lightExplanation
The greenhouse effect occurs because Earth's atmosphere is transparent to visible light. This means that visible light from the sun can easily pass through the atmosphere and reach the Earth's surface. However, when this visible light is absorbed by the Earth's surface, it is re-emitted as infrared radiation. Unlike visible light, the Earth's atmosphere is not transparent to infrared radiation and acts as a greenhouse, trapping some of the heat near the Earth's surface. This is what causes the greenhouse effect and contributes to the warming of the planet.Rate this question:
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- 21.
Why does Jupiter have three distinct layers of clouds?
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Clouds for randomly, so on average there are always three layers
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The three layers reflect regions of Jupiter's atmosphere with different chemical compositions
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Jupiter has three different types of wind, each of which makes a different type of cloud
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The three layers represent clouds made of gases that condense at different temperatures
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None of the above
Correct Answer
A. The three layers represent clouds made of gases that condense at different temperaturesExplanation
The three layers of clouds on Jupiter represent clouds made of gases that condense at different temperatures. This means that different types of gases in Jupiter's atmosphere condense at different altitudes, forming distinct layers of clouds.Rate this question:
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- 22.
Which of the following is NOT a characteristic of the inner planets?
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Their orbits are relatively closely spaced
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They are relatively smaller than outer planets
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They all have deep, substantial atmospheres
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They have very few, if any, moons
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They all have solid, rocky surfaces
Correct Answer
A. They all have deep, substantial atmospheresExplanation
The inner planets are characterized by several features such as closely spaced orbits, smaller size compared to outer planets, few or no moons, and solid rocky surfaces. However, the statement "They all have deep, substantial atmospheres" is not true for the inner planets. In fact, the inner planets have relatively thin atmospheres compared to the outer planets.Rate this question:
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- 23.
Even thought Venus is essentially the same size as Earth, its surface conditions are vastly different due to
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Venus' stronger magnetic field
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A runway greenhouse effect
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Extensive liquid water on the surface
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Tidal heating
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All of the above
Correct Answer
A. A runway greenhouse effectExplanation
The correct answer is a runaway greenhouse effect. This is because Venus has a thick atmosphere composed mainly of carbon dioxide, which traps heat and leads to a greenhouse effect. The high concentration of greenhouse gases causes the temperature on Venus to skyrocket, making it the hottest planet in the solar system. This extreme greenhouse effect is responsible for the vastly different surface conditions on Venus compared to Earth, despite their similar sizes.Rate this question:
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- 24.
What is the Great Red Spot?
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A place where reddish particles from Io impact Jupiter's surfaces
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A long-lived hurricane-like storm on Jupiter
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A visual effect that comes and goes as the magnetic field on Jupiter varies
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A region on Jupiter where the temperature is so high that the gas glows with red visible light
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None of the above
Correct Answer
A. A long-lived hurricane-like storm on JupiterExplanation
The Great Red Spot is a long-lived hurricane-like storm on Jupiter. It is a giant storm that has been observed for over 300 years and is characterized by its reddish color. The storm is so large that it could engulf the entire Earth. It is believed to be a high-pressure system with winds reaching speeds of up to 400 miles per hour. The exact cause of its red color is still not fully understood, but it is thought to be due to chemical reactions happening within the storm.Rate this question:
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- 25.
The similarities seen in the chemical compositions of the Sun and planets mean that
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The Sun if formed first and ejected all planetary material
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The Sun and planets are formed from a single, common source
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The planets and Sun were physically connected together at one point
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The planets and Sun all formed extremely close to one another
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All of the above
Correct Answer
A. The Sun and planets are formed from a single, common sourceExplanation
The correct answer is that the Sun and planets are formed from a single, common source. This means that the Sun and the planets were all formed from the same materials and processes, indicating a shared origin. This explanation is supported by the similarities in the chemical compositions of the Sun and the planets, suggesting that they all formed from the same pool of materials.Rate this question:
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- 26.
Which of the following is NOT an effect caused by convection?
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Volcanoes
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Earthquakes
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Continental drift
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The internal heating of the Earth's core
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None of the above
Correct Answer
A. The internal heating of the Earth's coreExplanation
The internal heating of the Earth's core is not caused by convection. Convection is the process of heat transfer through the movement of a fluid, such as the movement of hot magma in the mantle causing plate tectonics and continental drift, or the movement of air in the atmosphere causing weather patterns. The internal heating of the Earth's core is primarily due to radioactive decay and residual heat from the planet's formation, not convection.Rate this question:
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- 27.
What mechanism is most responsible for generating the internal heat that drives Io's volcanic activity?
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Radioactive decay
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Accretion
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Tidal Heating
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Bombardment
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Differentiation
Correct Answer
A. Tidal HeatingExplanation
Tidal Heating is the most responsible mechanism for generating the internal heat that drives Io's volcanic activity. Tidal heating occurs due to the gravitational interactions between Io and Jupiter, causing tidal forces that generate friction and heat within Io's interior. This heat leads to the melting of rocks and the formation of magma, which eventually erupts through volcanic activity on Io's surface. This process is evident in the numerous active volcanoes and the extensive volcanic activity observed on Io.Rate this question:
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- 28.
Which of the following planets does not orbit in the plane of the Solar System?
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Earth
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Mercury
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Neptune
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Uranus
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None of the above
Correct Answer
A. None of the aboveExplanation
All of the planets listed in the options, including Earth, Mercury, Neptune, and Uranus, orbit in the plane of the Solar System. Therefore, none of the above options is correct as they all orbit in the same plane as the rest of the planets.Rate this question:
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- 29.
Which of the following best explains why many Jovian moons have been more geologically active than the Moon or Mercury?
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The jovian moons are considerably larger than the Moon and Mercury and therefore have retained much more internal heat
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The jovian mons probably have far more internal heat generated by radioactive decay than do the Moon or Mercury
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Because of their greater distances from the Sun, the jovian moons receive much less heat from the Sun
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Jovian moons are made mostly of ice that can melt of deform at lower temperature than can the rock and metal that make up the Moon and Mercury
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None of the above
Correct Answer
A. Jovian moons are made mostly of ice that can melt of deform at lower temperature than can the rock and metal that make up the Moon and MercuryExplanation
The Jovian moons are made mostly of ice, which has a lower melting point than the rock and metal that make up the Moon and Mercury. This means that the Jovian moons can melt or deform at lower temperatures, allowing for more geological activity. The larger size and greater distance from the Sun are not the main factors contributing to their geological activity.Rate this question:
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- 30.
Which of the following statement explains the mechanism of the greenhouse effect?
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The atmosphere blocks high energy photons like X-rays from reaching the surface
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Heat from the interior of Earth is released through earthquakes and volcanoes and cannot escape
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Visible light from the Sun is absorbed by the upper layers of the atmosphere and reemitted to lower layers
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Visible light from the Sun is absorbed by the ground, reemitted as infrared and does not escape the atmosphere
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None of the above
Correct Answer
A. Visible light from the Sun is absorbed by the ground, reemitted as infrared and does not escape the atmosphereExplanation
The correct answer explains that visible light from the Sun is absorbed by the ground and then reemitted as infrared radiation. This infrared radiation is unable to escape the atmosphere, leading to the trapping of heat and the greenhouse effect.Rate this question:
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- 31.
If you compare a small, terrestrial planet to a larger one which of the following is true?
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The smaller planet will have a cooler interior than the larger planet
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The smaller planet will have a stronger magnetic field than the larger planet
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The smaller planet will be closer to its star than the larger planet
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The smaller planet will have a thicker atmosphere than the larger planet
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None of the above
Correct Answer
A. The smaller planet will have a cooler interior than the larger planetExplanation
The explanation for the correct answer is that smaller planets have a higher surface-to-volume ratio compared to larger planets. This means that smaller planets lose heat more quickly than larger planets, resulting in a cooler interior. The larger planets have a larger volume, which allows them to retain heat for a longer period, resulting in a hotter interior.Rate this question:
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- 32.
According to astronomers' best estimate the age of the Solar System is about ___ years
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4.5 million
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45,000
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4.5 billion
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4500
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None of the above
Correct Answer
A. 4.5 billionExplanation
The correct answer is 4.5 billion. Astronomers have determined that the age of the Solar System is approximately 4.5 billion years. This estimation is based on various scientific methods and evidence, such as the age of the oldest rocks on Earth, the dating of meteorites, and the study of the formation and evolution of stars and planets. Through these investigations, scientists have been able to establish a timeline for the formation of our Solar System, placing its age at around 4.5 billion years.Rate this question:
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- 33.
Why is the sky on Earth blue?
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Because the molecules scatter blue light more effectively than red light
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Because the sun emits mostly blue light
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Because molecules scatter red light more effectively than blue light
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Because deep space is blue in color
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No one knows-this is one of the great mysteries of science
Correct Answer
A. Because the molecules scatter blue light more effectively than red lightExplanation
The sky on Earth appears blue because the molecules in the Earth's atmosphere scatter blue light more effectively than red light. When sunlight enters the atmosphere, it encounters molecules such as nitrogen and oxygen. These molecules are much smaller than the wavelength of visible light, causing them to scatter the shorter blue wavelengths more than the longer red wavelengths. As a result, our eyes perceive the scattered blue light, making the sky appear blue.Rate this question:
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- 34.
What kind of surface features can arise from tectonics?
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Mountains
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Volcanoes
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Cliffs
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Valleys
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All of the above
Correct Answer
A. All of the aboveExplanation
Tectonics refers to the movement and deformation of the Earth's crust, which can result in various surface features. Mountains are formed when tectonic plates collide or when one plate is forced beneath another. Volcanoes are created when magma rises to the surface through tectonic activity. Cliffs can form due to the uplift or erosion caused by tectonic forces. Valleys can also arise as a result of tectonic activity, such as when two parallel faults create a depression between them. Therefore, all of the mentioned surface features can arise from tectonics.Rate this question:
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- 35.
Which of following moons is the only one with an atmosphere?
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Ganymede
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Titan
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Callisto
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Europe
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Io
Correct Answer
A. TitanExplanation
Titan is the only moon among the given options that has an atmosphere. It is one of Saturn's moons and has a thick atmosphere composed mainly of nitrogen, with traces of methane and other hydrocarbons. The presence of an atmosphere on Titan makes it unique among the other moons listed, as the others either have no atmosphere or have very thin atmospheres.Rate this question:
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- 36.
Why do the interiors of the Jovian planets differ?
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Er from the Sun, so theThey differ due to giant impacts at the late stages of planet formation
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Accretion took longer further distant planets formed their cores later and captured less gas from the solar nebula than the close jovian planets
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The more distant planets formed in a cooler region of the solar nebula and therefore contain a greater proportion of ices than the close jovian planets
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The more distant planet planets had longer to form than the close planet, since the solar nebula laster longer at greater distances from the Sun
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All of the above
Correct Answer
A. Accretion took longer further distant planets formed their cores later and captured less gas from the solar nebula than the close jovian planetsExplanation
The interiors of the Jovian planets differ because accretion took longer for the further distant planets, causing them to form their cores later and capture less gas from the solar nebula compared to the close jovian planets. This difference in accretion and gas capture resulted in variations in the composition and structure of the planet interiors.Rate this question:
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