How is a pothole formed?

A. Through deposition of sand on the inside curve of a meander
B. By the saltation of individual sand grains on a muddy stream bed
C. Because of the chemical weathering of rocky banks by acidic river water
D. Through the swirling, scouring action of pebbles on a hard stream bed
E. Through erosion of a muddy bank on the outside curve of a meander


Answer: D

Environmental & Atmospheric Sciences

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