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
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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MENTOR - National Mentoring Partnership
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