Earth Science Vocabulary Exam Quiz!

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The movement of rock and particles by wind, water, ice or gravity.
- Erosion
- Weathering
- Deposition

About This Quiz

Earth history is a way in which we get to learn about the physical constitution of the earth. There is a lot of vocabulary that we have come across in our classes, and the quiz mentioned below is designed to test your understanding of the ones we covered in the second semester. If you believe you can tackle it all See moreyou have to do is prove it.

Earth Science Vocabulary Exam Quiz! - Quiz

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2.

Chemical change caused by a chemical reaction. One substance changes into another.
- Mechanical Weathering
- Chemical Weathering
- Physically Weathering
Correct Answer

A. Chemical Weathering

Explanation

Chemical weathering refers to the process where the composition of a substance is altered due to a chemical reaction. In this process, one substance is transformed into another. Unlike mechanical weathering, which involves physical forces like wind or water, chemical weathering occurs when minerals in rocks react with water, air, or other substances, leading to changes in their chemical composition. This can result in the breakdown or dissolution of rocks over time. Therefore, the given answer, "Chemical Weathering," is the correct choice to describe a chemical change caused by a chemical reaction where one substance changes into another.

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1
3.

A type of weathering in which rocks are physically broken into smaller pieces. A physical change includes change in size and shape.
- Mechanical Weathering
- Chemical Weathering
Correct Answer

A. Mechanical Weathering

Explanation

Mechanical weathering refers to the process by which rocks are physically broken down into smaller pieces. This can occur through various mechanisms such as frost wedging, thermal expansion and contraction, and the actions of plants and animals. In mechanical weathering, the rocks undergo a physical change in size and shape, as opposed to a chemical change where the composition of the rocks is altered. Therefore, mechanical weathering is the correct answer in this case.

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1
4.

All sediment picked up by wind eventually falls to the ground. When particles carried by wind, water, or ice, are deposited (dropped) in another location.
- Weathering
- Erosion
- Deposition
Correct Answer

A. Deposition

Explanation

Deposition is the correct answer because it refers to the process of particles being dropped or deposited in a new location after being carried by wind, water, or ice. This process occurs when the transporting agent loses energy and can no longer carry the sediment, causing it to settle and accumulate on the ground.

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5.

A long, narrow glacier that forms when snow and ice buildup in a mountain valley.
- Valley Glacier
- Continental Glacier
Correct Answer

A. Valley Glacier

Explanation

A valley glacier is formed when snow and ice accumulate in a mountain valley over a long period of time. As more snow falls, it compacts and turns into ice, gradually forming a long and narrow glacier. The weight of the ice causes it to flow downhill, following the path of the valley. Valley glaciers are typically found in high mountain ranges and can carve out deep valleys as they move. They are different from continental glaciers, which are much larger and cover vast areas of land.

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6.

A glacier that covers much of a continent or large island.
- Valley Glacier
- Continental Glacier
Correct Answer

A. Continental Glacier

Explanation

A glacier that covers much of a continent or large island is known as a continental glacier. This type of glacier is massive in size and can spread across vast areas, shaping the landscape as it moves. Unlike valley glaciers, which are confined to valleys and mountainous regions, continental glaciers are not restricted by topography and can cover entire landmasses. They are responsible for sculpting features like U-shaped valleys, moraines, and drumlins.

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7.

The sediments deposited directly by a glacier.
- Till
- Moraine
- Rock Sediment
Correct Answer

A. Till

Explanation

Till is the correct answer because it refers to the sediments that are directly deposited by a glacier. When a glacier moves, it carries and transports a variety of materials, such as rocks, sand, and clay. As the glacier melts, it drops these materials, creating a mixture of unsorted sediments known as till. Till can vary in size and composition, containing a range of particles from large boulders to fine-grained clay. The deposition of till is a significant process in glacial landscapes and can contribute to the formation of landforms like moraines.

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8.

The process of scraping or wearing away.
- Weathering
- Erosion
- Deposition
Correct Answer

A. Weathering

Explanation

Weathering refers to the process of breaking down or wearing away of rocks, minerals, or other materials on the Earth's surface. This can occur due to various factors such as temperature changes, wind, water, ice, and chemical reactions. Weathering does not involve the movement of these materials, but rather the physical or chemical breakdown. Erosion, on the other hand, involves the transport and movement of these weathered materials by agents like wind, water, or ice. Deposition refers to the dropping or settling of these transported materials in a new location. Therefore, weathering is the correct answer as it specifically describes the process of scraping or wearing away.

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9.

A ridge formed by the till deposited at the edge of a glacier.
- Till
- Moraine
Correct Answer

A. Moraine

Explanation

A moraine is a ridge that is formed by the till, which is the material deposited by a glacier. As the glacier moves and melts, it carries rocks, soil, and other debris with it. When the glacier reaches its maximum extent or starts to retreat, it deposits this material at its edges, forming a ridge-like feature known as a moraine. This process of deposition creates distinct landforms that can be observed in areas where glaciers have been present.

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10.

The process by which wind removes surface materials.
- Weathering
- Deflation
- Deposition
Correct Answer

A. Deflation

Explanation

Deflation refers to the process by which wind removes surface materials. It involves the lifting and carrying away of loose particles such as sand, dust, and soil by the force of wind. This process is common in arid and desert regions where there is little vegetation to hold the soil in place. The wind erodes the surface, leaving behind a flat and barren landscape. Therefore, deflation is the correct answer to the question.

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1
11.

Water that moves over Earth’s surface
- Snow
- River
- Runoff
Correct Answer

A. Runoff

Explanation

Runoff refers to water that flows over the surface of the Earth, typically after rainfall or the melting of snow. It includes water that runs off from fields, roads, rooftops, and other surfaces, eventually collecting in streams, rivers, lakes, or the ocean. Runoff plays a crucial role in the water cycle, as it helps replenish water bodies and can also lead to erosion, sedimentation, and the transport of pollutants.

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12.

Wide area of land along a river.
- Walking Space
- Bridge
- Flood Plain
Correct Answer

A. Flood Plain

Explanation

A flood plain is a wide area of land along a river that is prone to flooding. It is a flat and low-lying area that is adjacent to the river channel. During periods of heavy rainfall or snowmelt, the river overflows its banks and the water spreads out onto the flood plain. This natural process helps to regulate the flow of water and prevents the river from overflowing its banks in more populated areas. The flood plain is often fertile and is used for agriculture, but it carries a risk of flooding and requires careful land management.

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13.

The preserved remains or traces of living things.
- Skull
- Fossil
- Preserved Remains
Correct Answer

A. Fossil

Explanation

A fossil refers to the preserved remains or traces of living things. It can include various parts of an organism, such as bones, teeth, shells, or imprints. Fossils are formed through a process called fossilization, where the organic material is replaced by minerals over time. The skull mentioned in the options is one example of a fossil, as it is a preserved remains of a living thing. Therefore, the correct answer is "Fossil."

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14.

A scientist who studies fossils to learn about organisms that lived long ago.
- Astronomer
- Geologist
- Paleontologist
Correct Answer

A. Paleontologist

Explanation

A paleontologist is a scientist who studies fossils to learn about organisms that lived long ago. They examine and analyze the remains of plants and animals that have been preserved in rocks and sediments. By studying fossils, paleontologists can gain insights into the evolution and biodiversity of ancient life forms, as well as the environmental conditions in which they lived. They use various techniques and tools to extract, identify, and interpret fossils, contributing to our understanding of the history of life on Earth.

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15.

A record of the geologic events and life forms in Earth’s history.
- Fossil
- Geological Time Scale
- Timeline
Correct Answer

A. Geological Time Scale

Explanation

The Geological Time Scale is a record of the geologic events and life forms in Earth's history. It represents a timeline that organizes and categorizes the different periods and epochs of Earth's history, providing a framework for understanding the sequence of events and the evolution of life on our planet. It helps scientists study and interpret the Earth's past, including the formation of rocks, the development of life, and the occurrence of major geological events such as mass extinctions. The Geological Time Scale is an essential tool for geologists and paleontologists in reconstructing Earth's history.

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16.

The age of a rock compared to the ages of rock layers.
- Absolute Age
- Relative Age
Correct Answer

A. Relative Age

Explanation

Relative age refers to the age of a rock or geological feature in relation to the ages of other rocks or features around it. It is determined by the principles of stratigraphy, which involve the study of the order and arrangement of rock layers. Relative age does not provide an exact numerical age, but rather helps to establish a sequence of events or determine whether one rock is older or younger than another. In contrast, absolute age refers to the specific numerical age of a rock or feature, usually determined through radiometric dating methods.

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17.

The age of a rock given as the number of years since the rock formed.
- Absolute Age
- Relative Age
Correct Answer

A. Absolute Age

Explanation

Absolute age refers to the exact age of a rock or any geological object, measured in years since it was formed. This age can be determined through various techniques such as radiometric dating, which uses the decay of radioactive isotopes in the rock to calculate its age. Unlike relative age, which only provides the order of events or objects in relation to each other, absolute age provides a more precise and accurate measure of time. Therefore, the given statement accurately describes the concept of absolute age.

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18.

One of the three long units of geologic time between the Precambrian and the present.
- Era
- Period
- Column
Correct Answer

A. Era

Explanation

The correct answer is Era. An era is one of the three long units of geologic time, along with eons and periods. It is a significant division of time that spans millions of years and is characterized by distinct geological and biological events. The era is situated between the Precambrian, which is the earliest part of Earth's history, and the present day.

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19.

The process by which all the different kinds of living things have changed over time.
- Extincion
- Evolution
Correct Answer

A. Evolution

Explanation

Evolution is the correct answer because it refers to the process by which all the different kinds of living things have changed over time. It explains how species have adapted and diversified through natural selection, genetic variation, and other mechanisms. Evolution is supported by extensive scientific evidence from various fields such as paleontology, genetics, and comparative anatomy. It is a fundamental concept in biology and helps us understand the diversity of life on Earth.

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20.

Describes a type of organism that no longer exists anywhere on Earth.
- Evolution
- Extinction
- Die-off
Correct Answer

A. Extinction

Explanation

Extinction refers to the complete disappearance of a particular type of organism from the Earth. It occurs when a species fails to adapt to changes in its environment or faces significant threats that lead to its demise. Extinction can be caused by natural factors such as climate change or geological events, as well as human activities like habitat destruction, pollution, and overhunting. Once a species becomes extinct, it no longer exists anywhere on Earth, making it a suitable description for an organism that no longer exists.

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21.

Mixture that forms when one substance dissolves in another.
- Universal Solvent
- Mixture
- Solution
Correct Answer

A. Solution

Explanation

A solution is a mixture that forms when one substance dissolves in another. In a solution, the substance that dissolves is called the solute, and the substance that does the dissolving is called the solvent. The solvent is often referred to as the universal solvent because it has the ability to dissolve a wide variety of substances. Therefore, the correct answer is Solution.

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22.

The continuous process by which water moves from the Earth’s surface to the atmosphere and back.
- Precipitation
- Evaporation
- Water Cycle
Correct Answer

A. Water Cycle

Explanation

The water cycle refers to the continuous process of water moving from the Earth's surface to the atmosphere and back again. This process includes various stages such as evaporation, where water changes from a liquid state to a gas and rises into the atmosphere, and precipitation, where water vapor condenses and falls back to the Earth's surface in the form of rain, snow, or hail. The water cycle is essential for maintaining the Earth's water supply and plays a crucial role in regulating the planet's climate and weather patterns.

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23.

Water that fills the cracks and spaces in underground soil and rock layers.
- Ground Water
- Well Water
- City Water
Correct Answer

A. Ground Water

Explanation

Ground water refers to the water that accumulates in the cracks and spaces between soil and rock layers underground. It is a natural resource that can be accessed through wells and is commonly used for various purposes such as drinking water, irrigation, and industrial use. City water, on the other hand, typically refers to treated water supplied by municipal water systems, while well water specifically refers to water obtained from a well. Therefore, ground water is the most appropriate answer as it accurately describes the water filling the underground cracks and spaces.

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24.

Water that falls to Earth as rain, snow, hail, or sleet.
- Precipitation
- Condensation
- Evaporation
Correct Answer

A. Precipitation

Explanation

Precipitation refers to the water that falls to Earth in the form of rain, snow, hail, or sleet. This process occurs when water vapor in the atmosphere cools and condenses into liquid or solid form, becoming too heavy to remain suspended in the air and falling to the ground. Condensation, on the other hand, is the process by which water vapor in the air changes into liquid water, forming clouds. Evaporation is the process of water turning into vapor and rising into the atmosphere. Therefore, precipitation is the correct answer as it specifically refers to the water that falls to Earth.

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25.

The degree of purity of water, determined by measuring the substances in water besides water molecules.
- Water Pollution
- Water Quality
- Purified Water
Correct Answer

A. Water Quality

Explanation

Water quality refers to the degree of purity of water, which is determined by measuring the substances present in water besides water molecules. This includes measuring the levels of various contaminants, such as chemicals, pollutants, and microorganisms, in order to assess the suitability of water for various purposes, such as drinking, irrigation, or industrial use. Monitoring water quality is crucial for ensuring the safety and health of both humans and the environment, as poor water quality can lead to water pollution and various health risks.

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26.

The addition of any substance that has a negative effect on water or the living things that depend on the water.
- Water Pollution
- Water Quality
- Purified Water
Correct Answer

A. Water Pollution

Explanation

Water pollution refers to the introduction of any harmful substance into water bodies, such as rivers, lakes, and oceans, which negatively affects the water and the living organisms that rely on it. This can occur due to various human activities, such as industrial waste disposal, agricultural runoff, and improper sewage treatment. Water pollution can have severe consequences on aquatic ecosystems, leading to the decline of biodiversity, the destruction of habitats, and the contamination of drinking water sources. It is crucial to prevent and control water pollution to ensure the preservation of water quality and the well-being of both aquatic life and humans.

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27.

An imaginary line that passes through Earth’s center and the North and South poles, about which Earth rotates.
- Orbit
- Axis
- Equator
Correct Answer

A. Axis

Explanation

The correct answer is "Axis." The axis is an imaginary line that passes through the Earth's center and the North and South poles. It is the line around which the Earth rotates, causing day and night cycles. The axis also determines the tilt of the Earth, which is responsible for the changing seasons.

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28.

The spinning motion of a planet on its axis.
- Rotation
- Revolution
Correct Answer

A. Rotation

Explanation

Rotation refers to the spinning motion of a planet on its axis. This movement causes day and night as different parts of the planet are exposed to sunlight. The Earth, for example, rotates once every 24 hours, resulting in a full day-night cycle. This is different from revolution, which refers to the planet's movement around the sun.

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29.

The movement of an object around another object.
- Revolution
- Rotation
- Orbit
Correct Answer

A. Revolution

Explanation

Revolution refers to the movement of an object around another object. This term is commonly used in astronomy to describe the orbit of planets around the sun or the moon around the Earth. It implies a circular or elliptical path followed by the object as it revolves around the central body. Rotation, on the other hand, refers to the spinning or turning motion of an object around its own axis. Orbit is also related to the movement of objects around another object, but it specifically refers to the path followed by a celestial body in space.

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30.

The path of an object as it revolves around another object in space.
- Revolution
- Rotation
- Orbit
Correct Answer

A. Orbit

Explanation

An orbit refers to the path that an object follows as it revolves around another object in space. This can include the orbit of planets around the sun or the orbit of satellites around the Earth. It is different from rotation, which refers to the spinning of an object around its own axis. Revolution, on the other hand, can refer to a complete orbit or a single instance of an object completing its path around another object.

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31.

The attractive force between objects; its strength depends on their masses and the distance between them.
- Gravity
- Mass
- Weight
Correct Answer

A. Gravity

Explanation

Gravity is the correct answer because it is the force of attraction between objects. The strength of gravity depends on the masses of the objects and the distance between them. The greater the mass of an object, the stronger its gravitational pull. Similarly, the closer two objects are to each other, the stronger the gravitational force between them. Therefore, gravity is the force responsible for the attractive interaction between objects, and its strength is determined by mass and distance.

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32.

Why did we create games in science class last week?
- Because it was fun.
- To help us study and prepare for the upcoming exam...the one you are currently taking.
- IDK.
- Option 4
Correct Answer

A. To help us study and prepare for the upcoming exam...the one you are currently taking.

Explanation

The games were created in science class last week to help the students study and prepare for the upcoming exam.

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33.

One of the different apparent shapes of the moon as seen from Earth.
- Cheese Slices
- Phases
- Slices
Correct Answer

A. Phases

Explanation

The different apparent shapes of the moon as seen from Earth are referred to as phases. These phases occur due to the changing positions of the moon, Earth, and the sun. As the moon orbits around the Earth, the amount of sunlight that we see reflected off the moon's surface changes, creating the different phases such as new moon, first quarter, full moon, and last quarter. These phases are a result of the moon's illumination changing as it moves in its orbit. Therefore, the term "phases" accurately describes the different apparent shapes of the moon.

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34.

The partial or total blocking of one object in space by another.
- Phases
- Eclipse
- Lunar
Correct Answer

A. Eclipse

Explanation

An eclipse is the partial or total blocking of one celestial object by another. This can occur when the moon passes between the Earth and the sun, resulting in a solar eclipse, or when the Earth passes between the sun and the moon, causing a lunar eclipse. During an eclipse, the blocked object is temporarily obscured from view, creating a darkened or shadowed effect.

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35.

A large round pit caused by the impact of a meteoroid.
- Hole
- Crater
- Maria
Correct Answer

A. Crater

Explanation

A crater is a large round pit that is formed when a meteoroid impacts the surface of a celestial body, such as the Earth or the Moon. The impact of the meteoroid creates a hole in the ground, which is known as a crater.

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36.

The process by which hydrogen atoms join together in the sun’s core to form helium.
- Binding
- Nuclear Fusion
- Energy
Correct Answer

A. Binding

Explanation

The process by which hydrogen atoms join together in the sun's core to form helium is called nuclear fusion. During this process, the hydrogen atoms are bound together to create helium, releasing a tremendous amount of energy. Therefore, the correct answer is "Binding" as it accurately describes the process of hydrogen atoms binding together to form helium in nuclear fusion.

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37.

The inner layer of the sun’s atmosphere that gives off its visible light; the sun’s surface
- Corona
- Radiation Zone
- Photosphere
Correct Answer

A. Photosphere

Explanation

The photosphere is the inner layer of the sun's atmosphere that gives off its visible light. It is considered the sun's surface because it is the layer that we can directly observe and see as the bright disk of the sun. The photosphere is responsible for the majority of the sun's light and heat that reaches the Earth.

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38.

A dark area of gas on the sun’s surface that is cooler than surrounding gases.
- Solar Wind
- Solar Flare
- Sun Spots
Correct Answer

A. Sun Spots

Explanation

Sun spots are dark areas on the sun's surface that appear cooler than the surrounding gases. These spots are caused by magnetic activity on the sun and are relatively cooler because the magnetic fields inhibit the flow of heat from the sun's interior to its surface. Sun spots are often associated with solar flares and other solar phenomena, and their activity can have an impact on Earth's space weather.

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39.

An eruption of gas from the sun’s surface that occurs when the loops in sunspot regions suddenly connect.
- Solar Wind
- Solar Flare
- Sun Spots
Correct Answer

A. Solar Flare

Explanation

A solar flare is an eruption of gas from the sun's surface that occurs when the loops in sunspot regions suddenly connect. This sudden release of energy results in a burst of radiation across the electromagnetic spectrum, including X-rays and ultraviolet light. Solar flares can have significant impacts on Earth, causing disruptions in communication systems, power grids, and satellite operations. Therefore, the correct answer for this question is Solar Flare.

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40.

An imaginary pattern of stars in the sky.
- Main Sequence
- Constellation
Correct Answer

A. Constellation

Explanation

A constellation refers to an imaginary pattern of stars in the sky. These patterns were created by ancient civilizations to help them navigate and identify specific stars and celestial objects. Constellations are still used today as a way to locate and study different areas of the night sky. The term "main sequence" refers to a stage in the evolution of a star, where it is fusing hydrogen in its core. While both terms are related to stars, the concept of an imaginary pattern of stars in the sky aligns more closely with the idea of a constellation.

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41.

The distance that light travels in one year, about 9.5 million kilometers.
- Miles/Distance
- Light Year
- Electromagnetic Spectrum
Correct Answer

A. Light Year

Explanation

A light year is the distance that light travels in one year, which is approximately 9.5 million kilometers. It is a unit of measurement used in astronomy to represent vast distances in space. Since light travels at a constant speed, the distance it covers in a year can be used to calculate the distance between celestial objects. The concept of a light year helps astronomers understand and communicate the immense scale of the universe.

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42.

A graph relating the surface temperatures and absolute brightness of stars.
- Main Sequence
- H-R Diagram
Correct Answer

A. H-R Diagram

Explanation

The H-R diagram is a graph that plots the surface temperatures of stars against their absolute brightness. It is a useful tool in understanding the life cycle and characteristics of stars. The main sequence is a prominent feature on the H-R diagram, representing stars that are in the main phase of their lives, where they burn hydrogen in their cores. Therefore, the H-R diagram is the correct answer as it accurately describes the graph relating surface temperatures and absolute brightness of stars.

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43.

A diagonal area on an H-R diagram that includes more than 90 percent of all stars.
- Main Sequence
- Electromagnetic Spectrum
- Light Year
Correct Answer

A. Main Sequence

Explanation

The main sequence is a diagonal area on the H-R diagram that includes more than 90 percent of all stars. It represents the stage in a star's life where it is fusing hydrogen into helium in its core, thus producing energy and maintaining its stability. Stars in the main sequence are in a state of equilibrium, where the inward gravitational force is balanced by the outward pressure from nuclear fusion. This phase is the longest and most stable stage in a star's life cycle.

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44.

A large cloud of gas and dust in space, spread out in an immense volume.
- Solar Wind
- Nebula
Correct Answer

A. Nebula

Explanation

A nebula is a large cloud of gas and dust in space that is spread out over a vast volume. It is a region where stars are born and can also be the remnants of an exploded star. Nebulae are often illuminated by nearby stars or by the energy emitted from within the nebula itself. This explanation fits with the given description of a large cloud of gas and dust in space.

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45.

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.
- Universe
- Galaxy
Correct Answer

A. Galaxy

Explanation

A galaxy is a vast collection of stars, star systems, star clusters, dust, and gas that are held together by the force of gravity. It is a massive structure that contains billions or even trillions of stars, along with other celestial objects. Galaxies come in various shapes and sizes, ranging from spiral galaxies with distinct arms to elliptical galaxies with a more rounded shape. Our Milky Way galaxy is just one of the many billions of galaxies in the universe.

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46.

All of space and everything in it.
- Universe
- Galaxy
Correct Answer

A. Universe

Explanation

The correct answer is "Universe" because it encompasses all of space and everything in it. The universe includes all galaxies, stars, planets, and other celestial bodies. It is the vast expanse in which everything exists and interacts.

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47.

Our solar system is located in a spiral galaxy called the …..
- Snickers
- Twix
- Milky Way
Correct Answer

A. Milky Way

Explanation

Our solar system is located in a spiral galaxy called the Milky Way. The Milky Way is a barred spiral galaxy that contains billions of stars, including our Sun. It is named "Milky Way" due to its appearance as a band of hazy light in the night sky. Our solar system is located in one of the spiral arms of the Milky Way, known as the Orion Arm or Local Spur.

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48.

What is the name of the place astronauts stay in space for long periods of time?
- Rocket
- Lunar Module
- International Space Station
Correct Answer

A. International Space Station

Explanation

The International Space Station (ISS) is the correct answer because it is the place where astronauts stay in space for long periods of time. The ISS is a habitable space station that serves as a laboratory for scientific research and international cooperation. It orbits around the Earth and provides a living and working environment for astronauts from different countries.

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49.

Our SUN... is the only star in our solar system.
- True
- False
- IDK.
- Option 4
Correct Answer

A. True

Explanation

The statement is true because our Sun is indeed the only star in our solar system. The solar system consists of the Sun, planets, moons, asteroids, comets, and other celestial bodies that orbit around it. While there are billions of stars in the universe, the Sun is unique to our solar system and provides heat, light, and energy for all the planets, including Earth.

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Quiz Edited by
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Quiz Created by
MrsPorter8

Earth Science Vocabulary Exam Quiz!

The movement of rock and particles by wind, water, ice or gravity.

Quiz Preview

Chemical change caused by a chemical reaction. One substance changes into another.

A type of weathering in which rocks are physically broken into smaller pieces. A physical change includes change in size and shape.

All sediment picked up by wind eventually falls to the ground. When particles carried by wind, water, or ice, are deposited (dropped) in another location.

A long, narrow glacier that forms when snow and ice buildup in a mountain valley.

A glacier that covers much of a continent or large island.

The sediments deposited directly by a glacier.

The process of scraping or wearing away.

A ridge formed by the till deposited at the edge of a glacier.

The process by which wind removes surface materials.

Water that moves over Earth’s surface

Wide area of land along a river.

The preserved remains or traces of living things.

A scientist who studies fossils to learn about organisms that lived long ago.

A record of the geologic events and life forms in Earth’s history.

The age of a rock compared to the ages of rock layers.

The age of a rock given as the number of years since the rock formed.

One of the three long units of geologic time between the Precambrian and the present.

The process by which all the different kinds of living things have changed over time.

Describes a type of organism that no longer exists anywhere on Earth.

Mixture that forms when one substance dissolves in another.

The continuous process by which water moves from the Earth’s surface to the atmosphere and back.

Water that fills the cracks and spaces in underground soil and rock layers.

Water that falls to Earth as rain, snow, hail, or sleet.

The degree of purity of water, determined by measuring the substances in water besides water molecules.

The addition of any substance that has a negative effect on water or the living things that depend on the water.

An imaginary line that passes through Earth’s center and the North and South poles, about which Earth rotates.

The spinning motion of a planet on its axis.

The movement of an object around another object.

The path of an object as it revolves around another object in space.

The attractive force between objects; its strength depends on their masses and the distance between them.

Why did we create games in science class last week?

One of the different apparent shapes of the moon as seen from Earth.

The partial or total blocking of one object in space by another.

A large round pit caused by the impact of a meteoroid.

The process by which hydrogen atoms join together in the sun’s core to form helium.

The inner layer of the sun’s atmosphere that gives off its visible light; the sun’s surface

A dark area of gas on the sun’s surface that is cooler than surrounding gases.

An eruption of gas from the sun’s surface that occurs when the loops in sunspot regions suddenly connect.

An imaginary pattern of stars in the sky.

The distance that light travels in one year, about 9.5 million kilometers.

A graph relating the surface temperatures and absolute brightness of stars.

A diagonal area on an H-R diagram that includes more than 90 percent of all stars.

A large cloud of gas and dust in space, spread out in an immense volume.

A huge group of single stars, star systems, star clusters, dust, and gas bound together by gravity.

All of space and everything in it.

Our solar system is located in a spiral galaxy called the …..

What is the name of the place astronauts stay in space for long periods of time?

Our SUN... is the only star in our solar system.