The rate of erosion depends on factors like the volume of water going over the edge, the height of the drop, and the type of rocks that make up the base of the waterfall.
At Niagara, the volume of water is very high.
In fact, one-fifth of the world’s fresh water empties from the Great Lakes Superior, Huron, Michigan, and Erie over the falls into Lake Ontario.
Niagara is the second largest waterfall in the world.
Before you cancel your honeymoon suite with the heart-shaped tub, keep in mind that in the past 12,000 years the falls have moved about seven miles upstream and,
at this rate, they will disappear into Lake Erie in just under 23,000 years.
Enough time to visit on a honeymoon–and even a second honeymoon.