I'll just tell you what they said about it on the Discovery Channel,How the Earth Was Made or something like that. The falls are only about 10,000 years old,not billions. Just since the last ice age. And yes,they were eroding at a rate of 3 feet per year and in about 3500 years would have been all the way back to Lake Erie,then would just massively drain the Great Lakes,but a dam above the falls has controlled the erosion to about 1 foot per year. But yes,it comes from the entire Great Lakes Basin. Rainfall,snow melt,etc. When you consider how small of a "drain" it actually is to the entire basin,it's not going to go dry any time soon.
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Today's Featured Article - The Ferguson System Principal An implement cutting through the soil at a certain depth say eight inches requires a certain force or draft to pull it. Obviously that draft will increase if the implement runs deeper than eight inches, and decrease if it runs shallower. Why not use that draft fact to control the depth of work automatically? The draft forces are
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