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Air is the natural mixture of gases that surround the earth. It is made of 79% nitrogen, 20% oxygen, and 1% other gases, mostly carbon dioxide, and a bunch of others that nobody really cares about. The composition of air changes depending on where you are. For example, at very high altitudes, there is a lot of ozone (a funky form of oxygen), that reduces the amount of ultraviolet light that comes from the sun and gives us cancer and sunburns. Air is used to burn things, for example, a log. The oxygen in the air reacts with the stuff in the log to make a bunch of new stuff. The air we breathe in (this is important - if we don't breath, we die pretty quick) is used to burn the stuff we eat to make energy that we can use to eat more. The oxygen in the air pretty much drives our life. Plants use the carbon dioxide in the air to make sugars which they will later burn for energy.

Air also suspends clouds, which are water and turn into rain. This means that water moves around a lot. If water just sat around, a lot of things could only grow in a river.

Air also suspends objects. Think of it as swimming in water - just harder, so hard that it takes a bunch of smart people to figure out just how. Planes "float" on air.

Air holds heat, too. If there was no air, night would be colder than that stuff the doctor uses to freeze off your warts. All that energy from the sun would just leave instead of being held in by the air.

Air can also be a problem, it is hard for things to move around in it and it can push things. When you are walking around your living room this is not noticeable, but when you are driving a car really fast and watching that gas tank empty (or being impaled by flying debris in a hurricane) the "push" of air becomes a lot more noticeable.

In conclusion, air keeps things alive and powers the planet (and wastes your gas money, and kills people). Happy breathing!

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13y ago

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