Why are floods so common along the Red River of the North (in North Dakota, South Dakota, and Minnesota)?
A. The Red River Valley is geologically young (about 9,000 years old) and has not carved a deep valley.
B. River flow increases as winter snow melts and meltwater runs northward into still frozen parts of the river.
C. The gradient or slope of the riverbed is very low.
D. All of these choices are correct.
Answer: D
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