Since the Mississippi flows into the ocean and carries all that mud with it, why is the river getting deeper or wider over time eventually disappearing? Also where does its water come from?
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It does get wider and deeper upstream where it is much steeper. And this mud that is eroding away from the mountains does get deposited on the riverbed where the flow is calm. So rivers like the Mississippi does get shallower over time and naturally changes direction fairly regularly. But it will take quite a long time for the Rocky Mountains to erode away completely and end up in the Mississippi river delta, although it is slowly happening.
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