Which of the following statements about the rivers of the United States and Canada is false? A. The Grand Canyon was formed by the continuous flow of the Columbia River.
B. The Yukon river flows from British Columbia, through Alaska, and into the Bering sea.
C. The Colorado River runs through the Grand Canyon.
D. The Continental Divide acts as a boundary that determines to which ocean rivers flow.

A. The Grand Canyon was formed by the continuous flow of the Columbia River.

Explanation:

The Columbia River and the Grand Canyon do not have any touching point, let alone that the Grand Canyon has been formed by the flow of this river. Columbia River is a big river, and it flows through the northwestern part of the country. It is very important for the people that live in this part of the Untied States because the river flows into the Pacific Ocean, and it is big enough so that boats can move through it and go further in the mainland, so economically it is a very important feature in the region.

b. niger

explanation:

81 is a composite number.