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The mass of air surrounding the Earth.

The atmosphere consists of nitrogen (78%), oxygen (21%), and traces of other gases such as argon, helium, carbon dioxide, and ozone.

The atmosphere plays an important role in the protection of life on Earth; it absorbs ultraviolet solar radiation and reduces temperature extremes between day and night.

Source & ©: GreenFacts

The atmosphere is divided into such layers as the troposphere and the stratosphere.

Layers of the atmosphere:

Source & ©: based on Harcourt School publishers 

Stratosphere - Troposphere

Español: Atmósfera

Français: Atmosphère

Nederlands: Atmosfeer

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