When liquid water disappears, it turns into a gas (vapor) in the air
and can reappear as a liquid when cooled, or as a solid if cooled below
the freezing point of water. Clouds and fog are made of tiny droplets of
water.
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Earth and Space Science: Structure of the Earth system Grades 5-8, page 160 Water, which covers the majority of the earth's surface, circulates through the crust, oceans, and atmosphere in what is known as the "water cycle." Water evaporates from the earth's surface, rises and cools as it moves to higher elevations, condenses as rain or snow, and falls to the surface where it collects in lakes, oceans, soil, and in rocks underground. NSES Content Standard D
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