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The earth is warm because of the sun. That is pretty obvious. But, more specifically, the sun lets off radiation waves that go through the atmosphere, some being absorbed by the ozone in the stratosphere, others absorbed by the dust and clouds in the air, some reflected back into the air, but most absorbed by the land and water on the earth's surface. The water lets off heat into the air through convection - the transfer of heat through fluids. The solid ground lets off inferred rays which also contributes to the warming of the air. That is how earth is warmed. :)

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