Answer: Vegetation plays an important role in the water cycle by preventing soil erosion and increasing groundwater levels. ... Green plants also release water vapor in the air as a by-product of photosynthesis, thus involving groundwater in the water cycle. Plants soak up large amounts of water through their roots. The water then moves up the plant and evaporates from the leaves in a process called transpiration. The process of transpiration, like evaporation, returns water back into the atmosphere. The water cycle.
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