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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.
Lesson Summary. 1  Water flowing over Earthâs surface or underground causes erosion and deposition. 2  Water flowing over a steeper slope moves faster and causes more erosion. 3  How water transports particles depends on their size. 4  Runoff erodes the land after a heavy rain.