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