Rounding of Angular Edges of Rock Outcropping and Formation of Insitu,spherical

Multiple Choice

Rounding of angular edges of rock outcropping and formation of insitu,spherical boulders are both indications of ________.

A) chemical weather and associated spheroidal weathering
B) rock fall onto sharp edges breaking of angular corners of rock outcrops
C) dissolution of the rock surface by acid rain
D) humans and animals walking across the Earth's surface,wearing away the surface