Which is the best description of weathering? . a.. breakdown of rocks through mechanical or chemical processes. b.. processes that make it difficult to determine the age of rocks. c.. building up earth’s surface through deposition. d.. when rock layers form horizontally.

The best description of weathering is the following: breakdown of rocks through mechanical or chemical processes. Mechanical weathering is done through mechanical processes and it is accomplished by physical forces that break rock into smaller and smaller pieces without changing the rock's mineral composition.Chemical weathering on the other hand is the breaking down of rocks by chemical reactions. Correct A