A graded stream can be deepening its channel by down cutting while part of its energy is also widening its valley by ______ erosion.
A) downward
B) longitudinal
C) lateral
D) distal
E) proximal

Question

Quizplus · Accepted Answer

Lateral erosion occurs when a stream widens its valley by eroding the banks or sides of the channel. Downward erosion, as mentioned in the question, occurs when a stream deepens its channel by eroding the stream bed. Longitudinal erosion occurs when a stream erodes its channel in the direction of flow, causing the channel to lengthen. Distal and proximal erosion are not relevant to this question.

A Graded Stream Can Be Deepening Its Channel by Down