Ex 12. Read and complete the statement.

Niagara Falls

The Niagara Falls is located on the border between the United States and Canada. It is a group of falls in the state of New York and the Canadian Province of Orlando. This group is the second largest in the world in terms of volume of water flowing over its edge. It is the largest in North America. It is a popular tourist destination.

The Niagara Falls was formed approximately 10,000 years ago when glaciers melted at the end of the last ice age. Water from the Great Lakes carved a path of the Atlantic Ocean, formed the Niagara River. The Niagara Falls is not very high, but it is very wide. The amount of water flowing over the falls varies throughout the year. During season of high flow, usually springtime, more than 6 million cubic feet (165,000 m3) of water passes over the falls per minute. The annual average flow rate is almost 4 million cubic feet (110,000 m3) per minute.

1. The Niagara Falls was formed approximately ___________ years ago.

2. The Niagara Falls is the largest in ___________.

3. Water from the Great Lakes formed the ___________.

4. During springtime more than 6 million ___________ of water passes over the falls per minute.

5. The annual average ___________ is almost 110,000 m3 per minute.
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