Question

How are valleys formed

Answer 1

Answer:

These geological formations are created by running rivers and shifting glaciers. Valleys are depressed areas of land–scoured and washed out by the conspiring forces of gravity, water, and ice. Some hang; others are hollow. They all take the form of a "U" or "V.

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Answer 2

Imphal Valley are formed by the filling up (sitting) of ancient lake which once cover the whole valley. Such a plain is formed by the filling up of lakes is referred to as lacustrine plain. However, this Imphal Valley is formed by the deposition of sediments brought down by the rivers.