Which of the following is MOST likely to result in stream rejuvenation?
A) the discharge of a stream decreases
B) the base level of a stream drops
C) the land surface beneath a stream subsides
D) a drainage reversal occurs

Question

Quizplus · Accepted Answer

When the base level of a stream drops, the gradient of the stream increases, which causes erosion to occur at a faster rate. This can lead to the rejuvenation of the stream as it cuts down into its channel and creates a new, steeper gradient. The other options listed do not necessarily lead to stream rejuvenation. A decrease in discharge may lead to a reduction in erosion and sediment transport, but it is unlikely to cause wholesale rejuvenation. Subsidence of the land surface beneath a stream may result in the stream becoming slower and wider, which decreases the gradient and may lead to the stream becoming more meandering. Drainage reversal occurs when a stream changes its course and begins to flow in the opposite direction, which may lead to the development of a new drainage basin, but it is not necessarily related to stream rejuvenation.

Which of the Following Is MOST Likely to Result in Stream