Ultimately,the base level of a stream valley can be no lower than ________.
A)the average elevation of the continent on which it is found
B)sea level
C)the average elevation of the local catchment
D)the maximum elevation of the local catchment

Question

Quizplus · Accepted Answer

The base level of a stream valley is the lowest point to which a stream can erode its channel. This is ultimately determined by the level of the body of water or basin that the stream flows into, which is typically sea level. Therefore, choice B is the correct answer. A is incorrect because the average elevation of the continent is not directly related to the stream valley's base level. C and D are also incorrect as they relate to the local catchment area, which may vary in elevation and does not necessarily reflect the absolute lowest point at which a stream can erode.

Ultimately,the Base Level of a Stream Valley Can Be No