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.

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The Answer of 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.

John Wesley Powell Put Forward the Idea of Base Level,which