Earth's surface is heated by the sun's radiation as this radiation travels through space, enters the atmosphere, and warms elements inside the earth.
The main source of radiation is the Sun because this produces high amounts of heat due to nuclear fusion reactions that occur in its core.
Some of this radiation is reflected as long waves which go to the atmosphere, and makes the surface and atmosphere have a warm temperature.
Note: This question is incomplete; due to this, I provided an answer based on general knowledge.
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