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.
D) Most streams have lower gradient close to their base level.
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