5. Which of the following statements about the physical geography of North America is true?

Question

A. The most geologically active region of North America is found along the West Coast.
B. The ancient rock of the Canadian Shield covers about one-fourth of Canada.
C. The Mississippi drainage basin is the fifth largest in the world.
D. The largest tributary of the Mississippi is the Arkansas River.

Answer 1

http://geomaps.wr.usgs.gov/parks/province/pacifmt.html