_______________ radiation heat up the atmosphere of the earth.

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Solution

Sunlight is a part of an electromagnetic wave.
This emits light at different wavelengths and hence it is classified as an electromagnetic spectrum.
Among the seven different electromagnetic radiation, Infrared radiation is one of the radiations emitted by the sun.
Infrared radiation produces heat and thus it is the one that heats up the surface of the earth.
When the sunlight reaches the earth, it passes through several layers of the atmosphere.
Hence, infrared radiation heats up the atmosphere of the earth.

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