Lilia T.

Atmosphere is a mixture of gases sorrounding any celestial objects like Earth. It has gravitational field strong enough to prevent gases from escaping to outer space. The principal constituents of the atmosphere of the Earth are nitrogen which is 78 percent and oxygen which is 21 percent. The strong possibility exists that the steady increase in atmospheric carbon dioxide, mainly as the result of fossil - fuel combustion over the past century, may affect the Earth's climate through the process known as th