This is the lowest level at which a stream can no longer lower its bed because it flows into the ocean,lake,or another stream.
A) a waterfall
B) a knickpoint
C) base level
D) a longitudinal profile
E) an artesian well

Question

Quizplus · Accepted Answer

Base level is the lowest point to which a stream can erode its bed. It can be either ultimate base level which is the ocean, or temporary base level which is a lake or another stream. Once a stream reaches its base level, it can no longer erode its bed any further.

This Is the Lowest Level at Which a Stream Can