In geological terms, Niagara Falls is quite young. The formation of the Falls began at the end of the Ice Age. Huge torrents of water were released from melting ice and that water drained into what is now the Niagara River. About 12,300 years ago, the water plunged over the edge of the Niagara Escarpment, a cliff at what is now Lewiston, New York. The force of the water wore away the rock layers and Niagara Falls moved upstream until reaching its present location.
— Source http://www.niagarafallsstatepark.com/

A friend flew above these beautiful falls in September 2005. Share the view from the top.