Multiple Choice
John Wesley Powell put forward the idea of base level, which refers to
A) an imagined surface that extends inland from sea level, and is inclined gently upward.
B) a level below which a stream cannot erode its valley.
C) an evolutionary cycle of landscape development.
D) flat plateaus.
E) Both A and B are correct.
Correct Answer:

Verified
Correct Answer:
Verified
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