Air - Simple English Wikipedia

# Air

### From Wikipedia, a free encyclopedia written in simple English for easy reading.

  Air is one of the four classical elements – air, water, earth, and fire.

This is what the air is made of.

Air often means Earth's atmosphere (the clear gases we live in and breathe). On Earth, it is a mixture of gases (78% nitrogen, 20.9% oxygen, 1.1% other gases). It has no color or smell.

Air is an exact mixture of 78.03% Nitrogen, 20.99% Oxygen, 0.94% Argon, 0.03% Carbon Dioxide, 0.01% Hydrogen, 0.00123% Neon, 0.0004% Helium, 0.00005% Krypton, 0.000006% Xenon

Air is what we breathe, and we need the oxygen in the air to live. In our bodies, the lungs give oxygen to the blood, and give back carbon dioxide to the air.

The wind is moving air. Air can be polluted from gas, smoke, and ash. This pollution is one of the causes of global warming. Plants and animals also need air to live.

## [edit] See also

- Aircraft
- Airplane
- Airport
- Air space

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Categories: Basic English 850 words | Science | Weather | Materials

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