How does a rivers source constantly have water.
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It’s kind of misleading that we call a certain place ‘the source’ of a river because that’s not where the water is literally coming from. Rather, the water for a river is typically collected over a very large area where rain collects in many small rivulets until it builds up into a large stream. We just call one place ‘the source’ of the river because that is the point where we can say okay, this is definitely the river. Often this point is actually a spring – water collects on mountainsides and seeps into the ground, following underground channels until it emerges and forms a spring which feeds into a river. Or, it might be another feature like a glacier – snow collects in mountain valleys and slowly melts at one end, forming a glacial lake that then feeds a river.
I guess that only partially answered the question. The real answer then is that the river doesn’t run out of water because is being replenished all the time by rainwater or melting snow.
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