Synopsis
The Water Cycle - Water falling from summer storm clouds onto a field of wheat today will someday fall again somewhere else. This is the essence of the water cycle. The first step in the cycle is evaporation. Heated by sunlight, liquid water turns to vapor and enters the atmosphere. Another source of atmospheric water vapor is the respiratory process of plants. Vapor leaves plants through tiny pores called stomata. This process is called transpiration. As moist air ascends into the atmosphere…
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