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    by Krista Terebessy

    Air is a relatively even, or homogeneous mix of gases; mostly nitrogen at 78% and oxygen at 21% Ironically, and a good thing for us, air is never totally dry: water vapor in its gas form can contribute as much as 4% of the...read more

  • 2 of 2

    by Travis Visco

    There are many different types of clouds, but they are all formed from the same basic mechanism. This mechanism is the rising motion of air. When a parcel of air rises it cools, due to the colder temperatures in the upper ...read more

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