The hydrologic, or water, cycle is one of the essential cycles for maintaining life on Earth. The stages of the hydrologic cycle describe the processes by which water moves from the surface of the planet into the atmosphere and back again, ensuring that water supplies are renewed. The regular movement of water on Earth is affected by many factors, which can lead to patterns of flooding and drought.The hydrologic cycle begins as water on the Earth's surface evaporates from a liquid state to a gaseous one under high heat. This evaporated moisture rises into the atmosphere, where it condenses on small particles, forming clouds and fog. When a saturation point is reached, these water particles fall from the atmosphere, returning to the ground as precipitation -- rain, sleet or snow.
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