For the image below select the correct maturity level of each stream shown. Age

Question

For the image below select the correct maturity level of each stream shown. Age range from youngest to oldest is: Youthful>Mature > Old Age 1. A. B. C. A) -Mature Youthful -Old Age B) -Mature -Youthful -Old Age C) -Mature Youthful old Age What shape would a youthful stream valley have? A. Wider U shaped valley with a narrow flood plain and rolling hills. B. Wide flood plain and U shaped meandering stream bed with little remaining upland areas. C. Narrow, deep, V shaped stream valley incising an elevated land surface. D. Wide V shaped stream bed with terraces showing previous flood plains and differing elevations.

Explanation / Answer

1.

A(Youthful)- these streams have a huge gradient and has V shaped valleys as it cuts predominantly downwards.

B(Mature)- here narrow floodplain develops and lateral erosion occurs.

C(Old)- the channel gets more wider than its depth. Oxbow lakes lies within the flood plain.

2. The answer is option C. The youthful stage shows a narrow deep, V shaped stream valley as downcutting is more than lateral cutting.

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