1. The cities of Boston, New York, Philadelphia, and Washington, D.C., form a megalopolis called _________.

a. the Piedmont
b. Appalachia
c. Boswash
d. Continental Divide

2. The longest river in the United States is the _________ River.

a. Colorado
b. Mississippi
c. Ohio
d. Missouri

3. Which of the Great Lakes is the largest and deepest?

a. Erie
b. Superior
c. Huron
d. Michigan

4. The Great Lakes were created by _________.

a. earthquakes
b. man
c. glaciers
d. volcanoes

5. Why did the United States and Canada build locks on the St. Lawrence Seaway?

a. to cope with the problem of changing water levels
b. to create a water route to the Pacific Ocean
c. to increase the depth of the river
d. to make the river wider