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What is the principal method of stream erosion and involves wearing away of the bedrocks?

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What is the principal method of stream erosion and involves wearing away of the bedrocks?

(a) Hydraulic action

(b) Abrasion

(c) Attrition

(d) Corrosion

The question was asked during an interview for a job.

My doubt is from Works of Streams and Rivers in division Geological Work of Water of Engineering Geology

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Correct choice is (b) Abrasion

Explanation: Abrasion is the principal method of stream erosion and involves wearing away of the bedrocks and rocks along the banks of a stream or river by the running water with the help of sand grains, pebbles and gravels and all such particles that are being carried by it as load.

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