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Earth and Space Vocabulary

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Across
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Making a complete spin on an axis.
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The heaviness of an object; force of gravity on mass=weight.
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The outermost covering or layer.
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Making a complete turn or orbit around an axis or center.
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The planet that all known life exists on.
Down
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The star at the center of our solar system that supplies heat and light to Earth; its enormous gravity keeps the solar system in orbit.
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The path one object takes as it revolves around another object in space.
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The layer of gas surrounding planet earth; held in place by gravity and composed of a limited number of elements-primarily nitrogen and oxygen.
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An imaginary line that a sphere rotates around.
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Bowl-shaped indents or cavities on the surface of a planet, moon, or asteroid that are caused by a collision with another object such as a meteorite.
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A natural satellite that orbits a planet; some planets have no moons; others have over 60 moons.