Alevel, ppt case study of a waterfall

1. Niagara Falls A case study of a waterfall

3. Location

4. Niagara Falls are situated between Lakes Erie and Ontario The Great Lakes .

5. Niagara Falls

7. Niagara falls began here, at the Niagara Escarpment, about 12,000 years ago Resistant limestone (Dolomite)

8. A resistant limestone

9. Starting point of the Falls Position today 11.5 kilometres

29. In the end the final decision was that the expense would be too great. amount of loose rock from the base of the falls to enhance it's appearance. in 1969. The idea was to determine the feasibility of removing the large The flow over the American Falls was stopped completely for several months Interesting facts about Niagara Falls

32. Control structure

36. The control structure built in the 1950s has reduced erosionrates to 1 metre every 10 years from 1.50 metres every year.

37. Down stream from the falls there are more rapids and a gorge

38. Do the Falls Freeze over in the Winter?