How Does the Atmosphere Support Life on Earth?
The atmosphere supports life on Earth by protecting it from dangerous electromagnetic radiation, by creating and controlling weather and climate and by providing the gases that plants and animals need to breathe. The atmosphere is composed of the troposphere, the tropopause, the stratosphere, the mesosphere and the ionosphere.
The ozone layer, which lies in the upper stratosphere, is the planet’s primary protector from electromagnetic radiation in the ultraviolet band of the spectrum. UV rays are invisible to the human eye and are harmful to life. By absorbing the UV radiation, the ozone layer keeps the bulk of rays from reaching Earth’s surface. The ionosphere also helps to support life by absorbing energetic protons from the sun.
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