Air molecules are held near the earth's surface by ____.

Name: Air molecules are held near the earth's surface by ____.
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Question

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Gravity is the force that pulls air molecules towards the earth's surface and keeps them from flying off into space. This is why the earth has an atmosphere, which is the layer of gases surrounding the planet. Without gravity, the air molecules would be free to escape into space, which would make it impossible for life to exist on earth as we know it.

Air Molecules Are Held near the Earth's Surface by ____