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Atmosphere
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The atmosphere is the envelope of gases surrounding Earth or another planet. There are five layers within the atmosphere. They are the troposphere, the stratosphere, the mesosphere, the thermosphere and the exosphere. The atmosphere of Earth protects us and all of the living things on Earth from dangerous radiations from the sun. The atmosphere also keeps us warm. It holds the surface heat on the Earth and prevents it from radiating out into space. We call this the Greenhouse Effect.
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