Earth Science Plate Tectonics Quiz

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  • 1/50 Questions

    When Considering Plate Tectonics, the lithosphere is MOST likely broken up into what?

    • Pizza
    • Earthquakes
    • Tectonic plates
    • Erosion
Please wait...
About This Quiz

How much do you really know about plate tectonics? Let's check yourself now by taking this quiz!

Earth Science Plate Tectonics Quiz - Quiz

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  • 2. 

    Plate Tectonics is based on The Big Bang Theory.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    The statement is false because Plate Tectonics is not based on The Big Bang Theory. Plate Tectonics is a scientific theory that explains the movement and interaction of Earth's lithospheric plates, while The Big Bang Theory is a cosmological theory that explains the origin and evolution of the universe. These two theories are unrelated and explain different phenomena.

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  • 3. 

    A boundary between tectonic plates that slide past each other is called?

    • Transform boundary

    • Convergent boundary

    • Divergent boundary

    • Separation boundary

    Correct Answer
    A. Transform boundary
    Explanation
    A transform boundary is a type of tectonic plate boundary where two plates slide past each other horizontally. This movement can cause earthquakes as the plates get stuck and then suddenly slip past each other. This type of boundary is characterized by the absence of volcanic activity or the formation of new crust, unlike convergent and divergent boundaries.

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  • 4. 

    Stress that happens when something is stretched is called?

    • Compression

    • Solution

    • Tension

    • Divergent

    Correct Answer
    A. Tension
    Explanation
    When something is stretched, stress is created, and this stress is referred to as tension. Tension occurs when a force is applied to an object, causing it to stretch or elongate. This can be observed in various scenarios, such as when a rubber band is pulled or when a rope is stretched. Therefore, tension is the correct answer to the question.

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  • 5. 

    Stress that happens when something is squeezed is called?

    • Compression

    • Tension

    • Suspension

    • Divergent

    Correct Answer
    A. Compression
    Explanation
    Compression is the correct answer because stress that occurs when something is squeezed or pressed together is known as compression. This type of stress leads to a decrease in the volume or length of an object.

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  • 6. 

    How do tectonic plates fit together?

    • Like a layer cake

    • Like a jigsaw puzzle

    • Like a stack of books

    • Like a model car

    Correct Answer
    A. Like a jigsaw puzzle
    Explanation
    Tectonic plates fit together like a jigsaw puzzle because they have irregular edges that interlock with each other. This analogy suggests that the plates have different shapes and sizes, and when they come into contact, their edges fit together like puzzle pieces. This fitting allows the plates to move and interact with each other, causing geological phenomena such as earthquakes and the formation of mountains.

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  • 7. 

    How do fossils help explain continental drift?

    • Fossils show that animals crossed the Atlantic Ocean

    • Fossils don't explain continental drift

    • Fossils formed when drift happened

    • The same kind of fossils are on both sides of the Atlantic Ocean

    Correct Answer
    A. The same kind of fossils are on both sides of the Atlantic Ocean
    Explanation
    Fossils of the same kind found on both sides of the Atlantic Ocean suggest that the continents were once connected and have since drifted apart. This supports the theory of continental drift, as the presence of identical fossils in different continents implies that these landmasses were once joined together and have since moved apart over time. Therefore, the distribution of fossils provides evidence for the movement and separation of continents.

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  • 8. 

    What causes seismic waves?

    • Tidal waves

    • Volcanoes

    • Earthquakes

    • Tornadoes

    Correct Answer
    A. Earthquakes
    Explanation
    Seismic waves are caused by earthquakes. When there is a sudden release of energy in the Earth's crust, it creates vibrations that travel through the Earth in the form of seismic waves. These waves can be felt and measured by seismographs. Tidal waves, volcanoes, and tornadoes, on the other hand, do not directly cause seismic waves.

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  • 9. 

    What are large pieces of the lithosphere that move on top of the mantle called?

    • Mantle-pieces

    • Crust plates

    • Tectonic plates

    • Puzzle pieces

    Correct Answer
    A. Tectonic plates
    Explanation
    Tectonic plates are large pieces of the lithosphere that move on top of the mantle. These plates are responsible for the movement and interaction of Earth's crust, leading to various geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges. The term "mantle-pieces" and "puzzle pieces" do not accurately describe these plates, while "crust plates" is not a commonly used term in geology. Therefore, the correct answer is tectonic plates.

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  • 10. 

    What do we call the amount of force placed on something?

    • Drift

    • Uplift

    • Bending

    • Stress

    Correct Answer
    A. Stress
    Explanation
    Stress refers to the amount of force or pressure exerted on an object or material. It measures the internal resistance of a material to deformation or strain caused by external forces. Stress can cause objects to change shape or break, depending on the magnitude and duration of the applied force. It is an important concept in engineering and physics, as it helps determine the structural integrity and stability of materials under different conditions.

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  • 11. 

    What do sceintists use to measure the MOVEMENT of tectonic plates?

    • Clinometers

    • Global positioning systems (GPS)

    • Telescopes

    • Seismographs

    Correct Answer
    A. Global positioning systems (GPS)
    Explanation
    Scientists use global positioning systems (GPS) to measure the movement of tectonic plates. GPS technology allows scientists to track the precise location of points on the Earth's surface over time. By placing GPS receivers on different points along the tectonic plates, scientists can measure the movement and velocity of these plates. This information is crucial for understanding plate tectonics and studying the dynamics of earthquakes, volcanoes, and other geological phenomena.

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  • 12. 

    What happens when rock cools?

    • Rock breaks

    • Rock rises

    • Rock sinks

    • Rock becomes denser

    Correct Answer
    A. Rock sinks
    Explanation
    When rock cools, it contracts and becomes denser. This increase in density causes the rock to sink. As the rock cools, the molecules within it slow down and move closer together, resulting in a decrease in volume. This decrease in volume leads to a decrease in buoyancy, causing the rock to sink. Therefore, the correct answer is that rock sinks when it cools.

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  • 13. 

    The deep interior of the Earth can be mapped using

    • Seismic waves

    • Sonar

    • Information from drilling expeditions

    • Ocean waves

    Correct Answer
    A. Seismic waves
    Explanation
    Seismic waves are the correct answer for mapping the deep interior of the Earth. Seismic waves are generated by earthquakes or explosions and can travel through the Earth's layers. By analyzing the behavior of these waves as they travel through different materials, scientists can infer the composition, density, and structure of the Earth's interior. This technique, known as seismic tomography, allows us to create detailed maps of the Earth's internal structure, including the location of different layers such as the crust, mantle, and core. Sonar is used to map the ocean floor, drilling expeditions provide information about the Earth's crust, and ocean waves are not suitable for mapping the deep interior of the Earth.

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  • 14. 

    Evidence for sea-floor spreading has come from

    • Fossils in South America and Africa

    • Magnetic reversals on the ocean floor

    • The breakup of Pangaea

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    The correct answer is "all of the above" because evidence for sea-floor spreading has been found in fossils in South America and Africa, which show similar species that were once connected but are now separated by the Atlantic Ocean. Additionally, magnetic reversals on the ocean floor provide evidence of sea-floor spreading, as the magnetic field of the Earth has reversed multiple times throughout history and these reversals are recorded in the oceanic crust. Finally, the breakup of Pangaea, the supercontinent that once existed, is also evidence of sea-floor spreading, as the continents have moved apart over time.

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  • 15. 

     What is the Earth made of?

    • Serveral layers

    • All solid rock

    • Hollow space

    • One layer

    Correct Answer
    A. Serveral layers
    Explanation
    The Earth is made up of several layers. These layers include the inner core, outer core, mantle, and crust. The inner core is a solid sphere made of iron and nickel, while the outer core is a liquid layer also composed of iron and nickel. The mantle is a semi-solid layer made of silicate rocks, and the crust is the outermost layer, consisting of solid rock. These layers have different compositions and properties, and they play a crucial role in shaping the Earth's structure and dynamics.

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  • 16. 

    What is the hypothesis that all continents were created by the break-up of Pangaea called?

    • Continental drift

    • Continental spreading

    • Wegener's puzzle

    • Tectonics

    Correct Answer
    A. Continental drift
    Explanation
    The correct answer is continental drift. Continental drift refers to the theory proposed by Alfred Wegener that suggests that all continents were once joined together as one supercontinent called Pangaea and have since drifted apart over millions of years. This theory explains the similarities in geological features, fossils, and climate patterns found on different continents. Continental spreading, tectonics, and Wegener's puzzle are not the specific terms used to describe this hypothesis.

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  • 17. 

    What happens when rock is heated?

    • Rock becomes denser

    • Rock rises

    • Rock sinks

    Correct Answer
    A. Rock rises
    Explanation
    When rock is heated, it undergoes thermal expansion. This means that the particles in the rock gain energy and move faster, causing the rock to expand and become less dense. As a result, the heated rock becomes lighter and rises.

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  • 18. 

    What did Alfred Wegener call the single large landmass that existed before sea-floor spreading created the Atlantic Ocean?

    • Eurasia

    • Gondwana

    • Pangaea

    • Laurasia

    Correct Answer
    A. Pangaea
    Explanation
    Alfred Wegener called the single large landmass that existed before sea-floor spreading created the Atlantic Ocean Pangaea. This term refers to the supercontinent that existed approximately 300 million years ago, which eventually broke apart into the continents we know today.

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  • 19. 

    What is it called when parts of the Earth's crust rise?

    • Downlift

    • Subsidence

    • Uplift

    • Letdown

    Correct Answer
    A. Uplift
    Explanation
    Uplift refers to the process when parts of the Earth's crust rise. This can occur due to various geological processes such as tectonic activity, volcanic eruptions, or the uplifting of sedimentary rocks. It is the opposite of subsidence, which is the sinking or downward movement of the Earth's crust. Letdown and downlift are not commonly used terms in geology and do not accurately describe the upward movement of the Earth's crust.

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  • 20. 

    What is the idea that tectonic plates move around called?

    • Convergent theory

    • Plate tectonics

    • Plate theory

    • Tectonic theory

    Correct Answer
    A. Plate tectonics
    Explanation
    Plate tectonics is the correct answer because it refers to the scientific theory that explains how the Earth's lithosphere, or the outermost layer of the Earth, is divided into several large and small plates that are constantly moving and interacting with each other. This theory suggests that the movement of these tectonic plates is responsible for various geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges. It provides a comprehensive understanding of the Earth's dynamic nature and the processes that shape its surface.

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  • 21. 

    A boundary between tectonic plates that move away from each other is called?

    • Transform boundary

    • Convergent boundary

    • Divergent boundary

    • Separation boundary

    Correct Answer
    A. Divergent boundary
    Explanation
    A divergent boundary is a boundary between tectonic plates that move away from each other. At these boundaries, new crust is formed as magma rises to the surface and solidifies, creating a gap between the plates. This process is known as seafloor spreading and is responsible for the formation of mid-ocean ridges. Divergent boundaries are characterized by volcanic activity, earthquakes, and the creation of new crust.

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  • 22. 

    Subduction is when

    • Earthquakes occur along a transform boundary

    • New crust is formed

    • One plate slides under another

    • New islands are formed

    Correct Answer
    A. One plate slides under another
    Explanation
    Subduction is the process in which one tectonic plate moves beneath another plate at a convergent boundary. This occurs when two plates collide, and the denser plate sinks into the Earth's mantle. As the subducting plate descends, it can cause earthquakes and volcanic activity. This process is responsible for the formation of deep-sea trenches, volcanic arcs, and mountain ranges.

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  • 23. 

    The mid-ocean ridge occurs  along a

    • Convergent boundary where new crust is formed

    • Transform boundary where crust is subducted

    • Divergent boundary where sea-floor spreading takes place

    • Divergent boundary where subduction takes place

    Correct Answer
    A. Divergent boundary where sea-floor spreading takes place
    Explanation
    The correct answer is divergent boundary where sea-floor spreading takes place. This is because the mid-ocean ridge is a long mountain range that runs through the middle of the ocean, and it is formed by the separation of tectonic plates at a divergent boundary. At this boundary, the plates move away from each other, causing magma to rise from the mantle and create new crust. As the new crust forms, it pushes the existing crust apart, leading to sea-floor spreading.

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  • 24. 

    The theory that states that pieces of Earth's crust are in constant, slow motion driven by movement in the mantle is called

    • The theory of continental drift

    • The theory of Pangaea

    • The theory of plate tectonics

    • The theory of plate boundaries

    Correct Answer
    A. The theory of plate tectonics
    Explanation
    The theory of plate tectonics explains that the Earth's crust is divided into several large and small plates that are constantly moving. These plates are driven by the movement of the underlying mantle. This theory provides a comprehensive explanation for various geological phenomena such as earthquakes, volcanic activity, and the formation of mountain ranges. It also explains the concept of plate boundaries, where plates interact and create different geological features. The theory of plate tectonics revolutionized our understanding of the Earth's dynamic nature and how its surface has changed over millions of years.

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  • 25. 

    Oceanic crust is ____________________ than continental crust

    • Less dense

    • More dense

    • Less hot

    • More hot

    Correct Answer
    A. More dense
    Explanation
    Oceanic crust is more dense than continental crust because it is primarily composed of basalt, which has a higher density compared to the granite and sedimentary rocks that make up continental crust. The basaltic composition of oceanic crust also contributes to its thinner and denser nature, as it is formed by the solidification of magma at mid-ocean ridges. In contrast, continental crust is thicker and less dense due to its composition and the accumulation of sedimentary layers over time.

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  • 26. 

    A place where an unusually hot part of the mantle rises through the crust causing volcanic activity is called a

    • Divergent boundary

    • Hot spot

    • Convergent boundary

    • Transform boundary

    Correct Answer
    A. Hot spot
    Explanation
    A hot spot refers to a location where there is an abnormally high temperature in the Earth's mantle, causing magma to rise through the crust and create volcanic activity. Unlike other types of boundaries such as divergent, convergent, or transform boundaries, a hot spot is not necessarily associated with the movement or interaction of tectonic plates. Instead, it is a localized area of intense heat that can lead to the formation of volcanic islands or chains, such as the Hawaiian Islands.

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  • 27. 

    The Himalayan mountains were formed because of a 

    • Hot spot

    • Divergent boundary

    • Transform boundary

    • Convergent boundary

    Correct Answer
    A. Convergent boundary
    Explanation
    The correct answer is convergent boundary. The Himalayan mountains were formed as a result of the collision between the Indian and Eurasian tectonic plates. This collision caused the crust to buckle and fold, leading to the formation of the towering Himalayan mountain range. The convergence of these two plates continues to this day, resulting in ongoing tectonic activity and the gradual uplift of the Himalayas.

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  • 28. 

    What causes the tectonic plates to move?

    • Ocean currents

    • Volcanoes

    • The Coriolis effect

    • Convection currents in the mantle

    Correct Answer
    A. Convection currents in the mantle
    Explanation
    The movement of tectonic plates is caused by convection currents in the mantle. The mantle is a layer of hot, semi-fluid rock beneath the Earth's crust. Heat from the Earth's core causes the rock in the mantle to heat up and rise, creating convection currents. As the heated rock moves towards the surface, it cools and sinks back down, completing the cycle. These convection currents exert a force on the tectonic plates, causing them to move and interact with each other at plate boundaries.

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  • 29. 

    A map of global earthquakes and volcanoes tells you

    • Where the edges of the continents are

    • Where the earth is the hottest

    • Nothing, it looks random

    • Where the plate boundaries are

    Correct Answer
    A. Where the plate boundaries are
    Explanation
    A map of global earthquakes and volcanoes tells you where the plate boundaries are. This is because earthquakes and volcanic activity are often associated with tectonic plate movements and interactions. By mapping the locations of these events, scientists can identify the boundaries where plates are colliding, sliding past each other, or pulling apart. This information is crucial for understanding the dynamics of the Earth's lithosphere and predicting potential seismic and volcanic hazards.

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  • 30. 

    The ring of fire is a ring of volcanoes and earthquakes that occur along

    • The mid-ocean ridge

    • Plate boundaries

    • Hot spots

    • Only transform boundaries

    Correct Answer
    A. Plate boundaries
    Explanation
    The ring of fire refers to a geographical area where a large number of earthquakes and volcanic eruptions occur. It is characterized by a ring-shaped arrangement of volcanoes and seismic activity. These plate boundaries are the areas where tectonic plates interact, either through convergence, divergence, or transform motion. This interaction leads to the formation of volcanoes and earthquakes, making plate boundaries the correct answer for the ring of fire.

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  • 31. 

    The process that continually adds new crust to the earth is:

    • Subduction

    • Earthquakes

    • Sea-floor spreading

    Correct Answer
    A. Sea-floor spreading
    Explanation
    Sea-floor spreading is the process that continually adds new crust to the earth. It occurs at mid-ocean ridges, where tectonic plates move apart and magma rises to the surface, creating new oceanic crust. As the new crust forms, older crust is pushed away from the ridge, leading to the spreading of the sea floor. This process plays a crucial role in plate tectonics and the formation of new oceanic crust.

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  • 32. 

    The place where two plates collide is called a

    • Transform boundary

    • Hot spot

    • Divergent boundary

    • Convergent boundary

    Correct Answer
    A. Convergent boundary
    Explanation
    When two tectonic plates collide, it forms a convergent boundary. At this boundary, the plates are forced together, causing intense pressure and compression. The collision can result in various geological features such as mountains, volcanic activity, and earthquakes. The convergent boundary is characterized by subduction zones, where one plate is forced beneath the other, creating a trench. This process is responsible for the formation of mountain ranges like the Himalayas and the Andes.

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  • 33. 

    Which is highest in the earth's interior?

    • Core

    • Lithosphere

    • Mantle

    Correct Answer
    A. Lithosphere
    Explanation
    The lithosphere is the outermost layer of the Earth's interior and is composed of the crust and uppermost part of the mantle. It is the thinnest layer compared to the core and mantle. The core is the innermost layer and is primarily made up of iron and nickel, while the mantle is located between the core and the lithosphere and is mainly composed of silicate rocks. Therefore, the lithosphere is the highest layer in the Earth's interior.

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  • 34. 

    Which is evidence of continental drift?

    • The fitting of South America and Africa

    • Similar fossils on different continents

    • Same rock layers on different continents

    • All of the above

    Correct Answer
    A. All of the above
    Explanation
    All of the given options provide evidence of continental drift. The fitting of South America and Africa suggests that they were once connected and have since moved apart. Similar fossils found on different continents indicate that these landmasses were once joined and the organisms spread when the continents separated. The presence of the same rock layers on different continents further supports the theory of continental drift, as it suggests that these landmasses were once part of the same geological formation.

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  • 35. 

    There are 4 main layers of the earth

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because the Earth can be divided into four main layers: the crust, mantle, outer core, and inner core. The crust is the outermost layer and is divided into continental and oceanic crust. The mantle is the thickest layer and is composed of solid rock. The outer core is liquid and made up of molten iron and nickel. The inner core is the deepest layer and is solid due to the immense pressure. These layers have different compositions and physical properties, and studying them helps scientists understand the Earth's structure and processes.

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  • 36. 

    Where stress builds up along a break in the earth's crust is called a fault. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    A fault is a fracture or break in the Earth's crust where stress builds up and causes movement. This movement can result in earthquakes. Therefore, it is correct to say that stress builds up along a fault in the Earth's crust.

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  • 37. 

    The most common cause of earthquakes is

    • Stress building up at faults

    • Tsunamis

    • Volcanos

    • Magma

    Correct Answer
    A. Stress building up at faults
    Explanation
    Earthquakes are primarily caused by stress building up at faults. Faults are fractures in the Earth's crust where rocks on either side have moved relative to each other. Over time, tectonic plate movements create stress along these faults. When the stress becomes too great, it is released in the form of an earthquake, causing the ground to shake. This release of energy is the result of the accumulated stress reaching a breaking point, making stress building up at faults the most common cause of earthquakes.

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  • 38. 

    Giant sea waves caused by earthquakes on the ocean floor are called

    • Tsunamis

    • Volcanoes

    • Faults

    • Seismograms

    Correct Answer
    A. Tsunamis
    Explanation
    Giant sea waves caused by earthquakes on the ocean floor are called tsunamis. These waves are generated when there is a sudden displacement of water due to the movement of the Earth's tectonic plates. Tsunamis can travel across the ocean at high speeds and can cause significant damage and loss of life when they reach coastal areas. Unlike normal ocean waves, tsunamis have much longer wavelengths and can travel across entire ocean basins. Therefore, tsunamis are the correct answer to the given question.

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  • 39. 

    The underground point of origin of an earthquake is the

    • Epicenter

    • Focus

    • Magma

    • Lava

    Correct Answer
    A. Epicenter
    Explanation
    The underground point of origin of an earthquake is known as the epicenter. This is the location on the Earth's surface directly above the focus, which is the actual point where the earthquake originates underground. The epicenter is the point where the seismic waves produced by the earthquake first reach the surface, causing the most intense shaking and damage. It is an important parameter used in earthquake studies and for determining the location and magnitude of an earthquake.

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  • 40. 

    The instrument used to detect and measure earthquake waves is called a 

    • Seismograph

    • Seismogram

    • Voltmeter

    • Barometer

    Correct Answer
    A. Seismograph
    Explanation
    A seismograph is an instrument specifically designed to detect and measure earthquake waves. It consists of a heavy mass attached to a frame or base, which remains stationary during an earthquake while the ground moves. As the ground shakes, the mass tends to remain in its original position due to inertia, while the frame or base moves with the ground. This relative motion is recorded by a pen or stylus attached to the mass, creating a visual representation of the earthquake waves called a seismogram. A voltmeter measures electric potential difference, while a barometer measures atmospheric pressure.

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  • 41. 

    The scale used to measure the strength of an earthquake is called the

    • Focus scale

    • The Milne scale

    • The Richter scale

    • San Andreas scale

    Correct Answer
    A. The Richter scale
    Explanation
    The Richter scale is the correct answer because it is a well-known and widely used scale to measure the strength of earthquakes. Developed by Charles F. Richter in 1935, it measures the amplitude of seismic waves produced by an earthquake. The scale is logarithmic, meaning that each whole number increase on the scale represents a tenfold increase in the amplitude of the seismic waves and roughly 31.6 times more energy release. The Richter scale provides a standardized way to compare the magnitude of earthquakes and is still commonly referenced in earthquake reporting and analysis.

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  • 42. 

    Hot liquid rock that is found deep within the earth is called

    • Lava

    • Magma

    • Ash

    • Cinders

    Correct Answer
    A. Magma
    Explanation
    Hot liquid rock that is found deep within the earth is called magma. Lava is the term used for magma when it reaches the earth's surface through volcanic eruptions. Ash and cinders are the solid remnants of volcanic activity, but they are not the correct terms for hot liquid rock found deep within the earth. Therefore, magma is the correct answer.

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  • 43. 

    The movement ofthe ocean floor on either side of the midocean ridge is best known as

    • Rifting

    • Sea-floor spreading

    • Subduction

    • Glaciation

    Correct Answer
    A. Sea-floor spreading
    Explanation
    Sea-floor spreading is the process in which the ocean floor moves apart on either side of the mid-ocean ridge. This movement occurs due to the upwelling of magma from the Earth's mantle, which creates new oceanic crust. As the new crust forms, it pushes the older crust away from the ridge, causing the ocean floor to spread. This process is responsible for the continuous formation of new oceanic crust and the widening of the ocean basins.

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  • 44. 

    Tectonic plates containing the earth's crust that form around form in the earth's

    • Lithosphere

    • Hydrosphere

    • Inner core

    • Atmosphere

    Correct Answer
    A. Lithosphere
    Explanation
    The lithosphere is the correct answer because it is the outermost layer of the Earth's surface that consists of tectonic plates. These plates are responsible for the movement and interaction of the Earth's crust. The hydrosphere refers to all water on Earth, the inner core is the solid innermost part of the Earth, and the atmosphere is the layer of gases surrounding the Earth.

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  • 45. 

    The earth's inner core is made of 

    • Oxygen and silicon

    • Iron and nickel

    • Iron and silicon

    • Copper and nickel

    Correct Answer
    A. Iron and nickel
    Explanation
    The correct answer is iron and nickel. The earth's inner core is believed to be primarily composed of iron and nickel based on scientific studies and observations. This is supported by seismic data and the behavior of seismic waves passing through the core. The high density of iron and nickel is consistent with the overall density of the inner core. Additionally, the presence of iron and nickel in meteorites that are thought to have originated from the core further supports this composition.

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  • 46. 

    The semi-liquid layer of the earth that can flow is called the

    • Lithosphere

    • Mantle

    • Inner core

    • Crust

    Correct Answer
    A. Mantle
    Explanation
    The correct answer is mantle. The mantle is a semi-liquid layer of the earth that lies between the crust and the outer core. It is composed of solid rock that can flow very slowly over long periods of time, similar to the consistency of hot tar. The movement of the mantle is responsible for the shifting of tectonic plates and the formation of volcanic activity.

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  • 47. 

    The innermost layer of the earth is known as the

    • Inner core

    • Outer core

    • Lithosphere

    • Mantle

    Correct Answer
    A. Inner core
    Explanation
    The innermost layer of the earth is known as the inner core because it is located at the very center of the earth. It is a solid sphere made primarily of iron and nickel. The immense pressure at the center of the earth keeps the inner core in a solid state, despite its extremely high temperature. The inner core plays a crucial role in the earth's magnetic field and is responsible for generating the earth's heat.

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  • 48. 

    When P waves and S waves reach the Earth's outer core they...

    • Both keep moving at the same speed

    • Both stop completely

    • S waves stop and P waves slow down

    • Nobody knows!

    Correct Answer
    A. S waves stop and P waves slow down
    Explanation
    When P waves and S waves reach the Earth's outer core, the S waves stop completely because they cannot travel through the liquid outer core. On the other hand, P waves slow down as they enter the outer core due to the change in medium from solid to liquid. This is because the speed of seismic waves is influenced by the properties of the material they travel through.

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  • 49. 

    Mountains can form at convergent boundaries. 

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Mountains can form at convergent boundaries because convergent boundaries occur when two tectonic plates collide. When oceanic plates collide with continental plates, the denser oceanic plate is forced beneath the continental plate in a process called subduction. The subduction causes the continental crust to buckle and fold, leading to the formation of mountain ranges. Examples of mountain ranges formed at convergent boundaries include the Himalayas, Andes, and the Alps. Therefore, the statement "Mountains can form at convergent boundaries" is true.

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