Question

what is mean by atmosphere​

Answer 1

Answer:

The atmosphere of Earth is the layer of gases, commonly known as air, that surrounds the planet Earth and is retained by Earth's gravity. ... By volume, dry air contains 78.09% nitrogen, 20.95% oxygen, 0.93% argon, 0.04% carbon dioxide, and small amounts of other gases.

it is a layer of earth

Answer 2

Answer:

An atmosphere is the layer or set layer's of gases surrounding a plant or other material body that is held in a place by the  gravity of that body.The atmosphere is the main reason the temperature is not so high  nor so low it's constant.

Explanation:- The atmosphere of the earth is composed of nitrogen(78%),oxygen(21%),argon(0.9%),carbon dioxide(0.04%) and other gases in trace amounts.Oxygen is used by the most organisms , the nitrogen is fixed by bacteria and lighting.