If the movement of the earth`s crust or a major climatic change makes an old stream young, it is called

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Q: 37 (CDS-I/2010)
If the movement of the earth's crust or a major climatic change makes an old stream young, it is called

question_subject: 

Geography

question_exam: 

CDS-I

stats: 

0,65,24,11,65,10,3

keywords: 

{'subsequent stream': [0, 0, 1, 0], 'major climatic change': [0, 0, 1, 0], 'old stream': [0, 0, 1, 0], 'consequent stream': [0, 0, 1, 0], 'aggradation': [1, 0, 2, 0], 'rejuvenation': [0, 0, 1, 1], 'earth': [0, 1, 1, 1], 'movement': [9, 3, 7, 28], 'crust': [1, 1, 0, 0]}

Rejuvenation refers to the process when a stream or river, which was previously old and mature, becomes young again due to changes in the earth`s crust or major climatic shifts. Let`s examine the other options to understand why they are not the correct answer.

Option 1: A consequent stream is one that follows the original slope of the land. It does not necessarily indicate a change in the stream`s age or maturity. Therefore, this option is incorrect.

Option 3: A subsequent stream refers to a stream or river that forms after the initial stream has already been established. It does not describe the rejuvenation process, where an existing stream becomes young again. Thus, this option is also incorrect.

Option 4: Aggradation refers to the deposition of sediment by a stream, which results in the raising of the streambed. It does not involve a change in the stream`s age or maturity. Therefore, this option is incorrect as well.

Hence, the correct answer is option 2, rejuvenation. It accurately describes the process of an old stream becoming young again due to geological or climatic changes.