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30 Cards in this Set
- Front
- Back
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What does the word phases mean?
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The shape of the lighted part of the moon.
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What does revolution mean?
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the movement of an object in an orbit around another object
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How long does it take for the Earth to make one revolution around the sun?
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365 days
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What does orbit mean?
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the path an object follows as it moves around another object
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What are the three parts of the water cycle?
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condensation
evaporation precipiation |
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What does evaporation mean?
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the change from a liquid to a gas
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What does condense mean?
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To change from a gas to a liquid
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What is the definition of atmosphere?
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air that surrounds the Earth
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What is dew?
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a type of precipitation that forms over night
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What is water vapor?
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water that is in the form of a gas
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What are the six simple machines?
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wedge, wheel and axle, lever, pulley, screw, inclined plane
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Why are simple machines created?
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to make work easier
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What is gravity?
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the force that pulls objects towards the center of the Earch
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What is friction?
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force caused by two objects rubbing together that slows down or stops moving objects
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What is a force?
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a push or pull
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How does the Earth rotate?
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On its axis
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What is the moon?
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the natural satellite of Earth
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What is the definition of axis?
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an imaginary straight line through the center of the Earth around which Earth rotates
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How does erosion occur?
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by water wind or other causes
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What happens when erosion occurs?
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rocks or soil is carried away
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What is pollution?
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anything harmful added to air, water or land
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Give an example of air pollution.
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smog
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What is weathering?
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the breaking apart and changing of rocks
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Name two ways weathering occurs.
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plants, water or ice
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What is magnetism?
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the force that causes magnets to pull on objects
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Which way would the north pole of a magnet point if dangled from the ceiling?
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the north because it acts as a compass
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Name a natural producer of light.
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sun, stars, comet, meteor, lightening, fire
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What is the Earth's natural satelitte?
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the Moon
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How does the Earth's rotation cause day and night?
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As the Erath rotates different parts of the Earth rotate into daytime at different times.
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What causes the seasons on Earth?
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the tilt of the Earth and its revolution around the sun
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