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 - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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