19. Geology

Spin through time to see how the Niagara River and the Great Lakes Basin are remnants of the last Ice Age 18,000 years ago. As thick ice sheets advanced southward they gouged out the basins of the Great Lakes. As they melted northward, they released vast quantities of water into these basins. The Niagara River is a connecting channel between Great Lakes, Erie and Ontario. Niagara Falls has moved back 7 miles in 12,500 years and may be the fastest moving waterfalls in the world. It exists because of the hard Dolomite rock layer. See if you can correctly stack the rock layers to create Niagara Falls.