What is an ephemeral stream?

A. One that is formed only from chemical weathering

B. One that flows only after rainfall

C. One that is formed only from mechanical weathering

D. One that flows only in flat lands

B. An ephemeral stream is one that flows only after rainfall

The correct answer is option B.

An ephemeral stream is one that flows only after rainfall.

Ephemeral streams only exist for a short period of time. They are often found in the desert landscape. Desert climate is arid with sparse to no vegetation. Without plants in the soil, rain water does not get absorbed, and so after rainfall excess water flow as ephemeral streams.