It goes down no?
In: Earth Science
A waterfall is not much different than the rest of the river. Rivers run horizontally, and a waterfall is a vertical section of that river. Niagara Falls is a 0.051 km vertical section of the 54 km long Niagara River. So, the question is less about why the Falls keeping falling, but why the River keeps run, since the rest of the river has much more water.
The answer to that is the water cycle. Niagara falls is fed by Lake Erie, which is fed by lake Huron, which is fed by lakes Michigan and Superior. So, it has a fairly large water supply. Those lakes stay full because of rain. Water from various places evaporate, and then fall in the lakes. If the water does not fall directly in the lakes, it falls in areas where the water will drain into the lakes. Also, a bunch of snow falls on the ground during the winter. When this snow melts in the spring and summer, it drains into the lake as well.
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