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 above which a stream cannot erode its valley.
C) an evolutionary cycle of landscape development.
D) flat plateaus.
E) the top surface of a delta.
Correct Answer:

Verified
Correct Answer:
Verified
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