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Sciences > Atmosphere & Weather The earth's atmosphere: 6 of 6

The earth's atmosphere consists of several layers of gas. They are called the troposphere, stratosphere, mesosphere, ionosphere, and exosphere. The troposphere is the first layer of gas closest to earth. It extends about 10 miles above the earth's surface. Above the troposphere is the stratosphere, which is the ozone layer. The atmosphere is composed of 78% nitrogen, 21% oxygen, 0.038% carbon dioxide and, a small amount of other gases. These gases are upheld by gravity. All life on earth depends on these gases to live and breathe. Humans and animals utilize oxygen for respiration. Plants u...
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