Which statement below best describes how narrow valleys form?
A) Streams tend to flow down abandoned mine shafts.
B) Stream cuts vertically, but valley sides cave in due to weathering and mass wasting.
C) Stream water dissolves the bedrock along a narrow swath of soluble bedrock.
D) Stream cuts vertically along soft fault gouge.

Question

Quizplus · Accepted Answer

Narrow valleys form primarily due to the vertical cutting action of streams, which is then followed by the caving in of valley sides as a result of weathering and mass wasting. This process gradually deepens and narrows the valley.

Which Statement Below Best Describes How Narrow Valleys Form