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Erosion may be defined as the wearing down of Earth’s surface through weathering and the transportation of the particles to distant places. For example, the boulder is first loosened in a mass movement and then its pieces are carried by the stream. Similarly, moving angular pieces of rocks produce etching which cuts the surface of …

Stages of Valley Development:

The development of stream valleys takes place in a orderly fashion. A valley passes through three stages during its evolution. The three stages are (i) Youth Stage, (ii) Mature Stage, and (iii) Old Stage. (1). Youth or Early Stage: A stream is said to be in the youth stage when it cuts its valley downward …