One of the main reason for the formation of T shaped Valley in the upper course of a river​

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Explanation:

Why is the upper course of a river narrow?

As the river moves through the upper course, it cuts downwards. The gradient here is steep and the river channel is narrow. ... As the river erodes the landscape in the upper course, it winds and bends to avoid areas of hard rock. This creates interlocking spurs, which look a bit like the interlocking parts of a zip.

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explanation:

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