Assertion (A) : River system can continue to cut down its valleys at approximately the same rate as uplift and so maintains its general pattern and direction. Reason (R) : In case of an antecedent drainage system, the river is said to have originated before a period of uplift and folding of land as a result of earth movement. Codes

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Assertion (A) : River system can continue to cut down its valleys at approximately the same rate as uplift and so maintains its general pattern and direction. Reason (R) : In case of an antecedent drainage system, the river is said to have originated before a period of uplift and folding of land as a result of earth movement. Codes