Asked by Christopher Piper on May 11, 2024
Verified
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.
Base Level
The lowest point to which erosion by running water can lower the landscape, ultimately the sea level or lake level where rivers end.
- Ascertain the determinants influencing the shape of a stream, including variations in the base level and incline.
Verified Answer
KH
Kirat HanjraMay 13, 2024
Final Answer :
D
Explanation :
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.
Learning Objectives
- Ascertain the determinants influencing the shape of a stream, including variations in the base level and incline.