What famous North American landmark is constantly moving backward?

Orangruffy

Niagara Falls May 27 03, 6:47 AM

greencavalier

I assume you mean the falls are eroding the rock beneath, so each year the water goes a bit less far along the river before falling. May 27 03, 7:33 PM

kandikandi

Niagra Falls is correct because the hundred of tons of water remove 2 1/2 feet of rock every year! Mar 27 08, 8:00 PM

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What famous North American landmark is constantly moving backwards? Can part of a wheel rolling forward along the ground be not moving? In what circumstances can a wheel be rolling forward but part of the wheel itself be moving backward? Why is it that for a flight to Venus space vehicles are aimed backward along the orbit of the earth, whereas for a flight to Mars they are fired in the direction the earth is moving? A train goes from north to south, although at all times there are certain areas of the train that are moving in a south-to-north direction. What are these areas?

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