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Earth and Space Vocabulary

Across
Making a complete spin on an axis.
The heaviness of an object; force of gravity on mass=weight.
The outermost covering or layer.
Making a complete turn or orbit around an axis or center.
The planet that all known life exists on.
Down
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.
The path one object takes as it revolves around another object in space.
The layer of gas surrounding planet earth; held in place by gravity and composed of a limited number of elements-primarily nitrogen and oxygen.
An imaginary line that a sphere rotates around.
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.
A natural satellite that orbits a planet; some planets have no moons; others have over 60 moons.