Answer :
Long wave terrestrial radiation is the principal source of atmospheric heating. The majority of the energy that reaches the earth's surface is in short wavelengths.
An atmosphere is a layer of gas or layers of gas that surround a planet and are held in place by the gravity of the planetary body (from the Ancient Greek (atmós) "vapour, steam" and (sphaîra) "sphere"). The outer region of a star, which includes the layers above the opaque photosphere, is known as the stellar atmosphere; stars of low temperature may have outer atmospheres containing compound molecules. Planets retain an atmosphere when their gravity is strong and their atmosphere's temperature is low.
The atmosphere of Earth is composed of nitrogen (78%), oxygen (21%), argon (0.9%), carbon dioxide (0.04%) and trace gases.
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