The sun provides energy for water to evaporate. Evaporation leaves behind minerals and other dissolved substances. Water vapor falls and condenses as precipitation, which runs of the land to join the surface water sources or groundwater sources beneath Earth’s surface. Here, bacteria remove any organic contaminants that are within the water that has entered the ground, if exposed for a long enough time. Another process endured by the groundwater is sand and gravel filtration, which removes any suspended material. Any water—when returned to the surface—can evaporated and continue flowing through the hydrologic cycle. Throughout the cycle, evaporation, bacterial action, and filtration purify water.
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