John Wesley Powell put forward the idea of base level, which refers to
A) the amount of discharge in a particular reach of a stream.
B) a level below which a stream cannot erode its valley.
C) an evolutionary cycle of landscape development from fluvial action.
D) the average height of a stream channel.

Question

Quizplus · Accepted Answer

Base level refers to a level below which a stream cannot erode its valley. John Wesley Powell theorized that every stream has a base level, which can either be the ocean, a lake, or a resistant rock layer, and that the stream cannot erode its channel below this point.

John Wesley Powell Put Forward the Idea of Base Level