Rounding of angular edges of rock outcropping and formation of in situ, spherical boulders are both indications of ______ .
A) dissolution of the rock surface by acid rain
B) humans and animals walking across the Earth's surface, wearing away the surface
C) chemical weathering and associated spheroidal weathering
D) rock fall onto sharp edges breaking of angular corners of rock outcrops

Question

Quizplus · Accepted Answer

Chemical weathering and associated spheroidal weathering can cause the rounding of angular edges of rock outcroppings and the formation of in situ, spherical boulders. Acid rain can also cause dissolution of the rock surface, but it is not the best choice in this case. Humans and animals walking across the Earth's surface can cause erosion, but it is unlikely to result in the specific patterns described. Rock fall can break off angular corners, but it does not explain the formation of spherical boulders.

Rounding of Angular Edges of Rock Outcropping and Formation of in Situ