Consider the following statements given below about the formation of valleys 1 In the early sta...........

Geography Geomorphology

Consider the following statements given below about the formation of valleys

1. In the early stages, down-cutting dominates during which irregularities such as waterfalls and cascades will be formed)

2. In the middle stages, streams cut their beds slower, and lateral erosion of valley sides becomes severe.

3. A lowland of faint relief with some low resistant remnants standing out here and there is called monadnocks.

Which the statement above given is/are correct?

1 ,2 and 3

2 and 3 only

1 and 3 only

2 only

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Explanation:

In the early stages, down-cutting dominates during which irregularities such as waterfalls and cascades will be removed. In the middle stages, streams cut their beds slower, and lateral erosion of valley sides becomes severe. Gradually, the valley sides are reduced to lower and lower slopes. The divides between drainage basins are likewise lowered until they are almost completely flattened leaving finally, a lowland of faint relief with some low resistant remnants called monadnocks standing out here and there. This type of plain forming as a result of stream erosion is called a peneplain (an almost plain).