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) the level of water in the world's oceans
C) the average depths of the world's ocean basins

Question

Quizplus · Accepted Answer

The base level of a stream valley is determined by the level of water in the world's oceans, because this is the ultimate destination of all water on land. In other words, a stream cannot erode its channel any lower than the level of the body of water into which it ultimately flows, which is the ocean in most cases. The average elevation of the continent or the average depths of the ocean basins are not directly related to the base level of a stream valley.

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