Discussion
A river erodes chiefly by hydraulic action, abrasion, attrition and
Answer: A
Correct answer: solution
A river erodes four ways: hydraulic action, the sheer force of the water prising material loose; abrasion, the load it carries scouring the bed and banks; attrition, the load wearing itself smaller as the fragments collide; and solution, the chemical removal of soluble rock. Deflation is a wind process and plucking a glacial one, so neither belongs to a river.
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