Which of the following statements about the physical geography of North America is true?
AThe Mississippi drainage basin is the fifth largest in the world.
BThe largest tributary of the Mississippi is the Arkansas River.
CThe most geologically active region of North America is found along the West Coast.
DThe ancient rock of the Canadian Shield covers about one-fourth of Canada.
AThe Mississippi drainage basin is the fifth largest in the world.
BThe largest tributary of the Mississippi is the Arkansas River.
CThe most geologically active region of North America is found along the West Coast.
DThe ancient rock of the Canadian Shield covers about one-fourth of Canada.