Life is adapted to conditions on the earth, including the force of gravity
that enables the planet to retain an adequate atmosphere, and an intensity
of radiation from the sun that allows water to cycle between liquid and
vapor.
NSES Content Standard D
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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