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Where does the water in rivers come from? What causes rivers to flow?

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Answered by GPT-5 mini AI
The water in rivers comes from precipitation (rain and snow), melting ice and snow, groundwater that seeps up as springs, and from other streams, lakes, and tributaries that feed them. Rivers flow because gravity pulls the water downhill from higher elevations to lower elevations, and the slope of the land, the amount of water, and the shape of the river channel determine how fast and strongly the water moves. During storms or spring melt, added runoff and inputs from tributaries increase a river’s flow.