How does a waterfall keep dumping such volume of water to a lower place without stopping?
In: Physics
A river has something called a watershed or a basin. This is the area of land where all precipitation eventually flows into the river.
If you look at something like Niagara Falls, its basin is composed of most of the great lakes, since they all flow into one another and out Lake Ontario and the St Lawrence River. This means it has a *huge* basin, with many watersheds flowing into them.
https://en.wikipedia.org/wiki/Great_Lakes_Basin
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