John Wesley Powell put forward the idea of base level.To which does this refer?
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 the lowest level to which a stream can erode its valley. This concept was introduced by John Wesley Powell. It can be either ultimate, which refers to the elevation at the mouth of the river where it enters a standing body of water, or local, which refers to the level below which the stream can not erode its channel. Option A is incorrect because discharge refers to the volume of water passing through a given cross-sectional area of a stream channel in a unit time. Option C is incorrect because an evolutionary cycle of landscape development is known as geomorphic cycle. Option D is incorrect because the average height of a stream channel is known as channel slope.

John Wesley Powell Put Forward the Idea of Base Level