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The water cycle is critical not only to weather, but to life on earth. Rain is necessary for the survival of plants and humans. Condensation is necessary for cloud formation. Evaporation is necessary to cooling and keeping a good balance of water vapor in the air.
[click here to see the diagram and copy it (including the labels) into your notes]. The water cycle process looks like this: Evaporation condensation precipitation infiltration run-off. Without this process, weathering, erosion, and deposition would have a difficult time occurring on Earth. Weathering. -- chemical and physical processes that change the characteristics of rocks on the Earth s surface.