Which of the following best explains why angular, crack-bounded, granitic blocks weather to spheroidal boulders?
A)Weathering agents have more direct access to edges and corners than to other parts of the block.
B)Interiors of blocks are constantly damp or wet because sunlight cannot penetrate.
C)Crack surfaces of blocks heat and cool more rapidly than edges and corners.
D)They slowly roll over in place and wear off the corners first.

Question

Quizplus · Accepted Answer

Weathering agents, such as rainwater and frost, have more direct access to edges and corners on angular, crack-bounded, granitic blocks than to other parts of the block. This differential weathering leads to the development of spheroidal boulders over time.

Which of the Following Best Explains Why Angular, Crack-Bounded, Granitic