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