Which of the following is true about the base level of a stream:
A) Base level indicates the normal or base) flow level before flooding.
B) The flat top of a mountain is the ultimate base level for most streams.
C) A mountain is close to its base level if bedrock is close to the surface.
D) Most streams have lower gradient close to their base level.
E) Base level generally is near the steepest part of a stream's profile.

Question

Quizplus · Accepted Answer

The base level of a stream is the lowest point to which it can erode its channel. As a stream approaches its base level, its gradient or slope decreases, leading to a lower gradient near the base level. This is because the energy of the stream decreases as it gets closer to its base level, reducing its capacity for erosion and transportation of sediments, which in turn flattens its gradient.

Which of the Following Is True About the Base Level