Question

which property of a rock remains unchanged by mechanical weathering? a. total surface area b. mineral composition c. size and shape d. sharpness

Explanation:

Mechanical weathering breaks rocks into smaller pieces. It changes size, shape, sharpness, and increases total surface area. However, it does not alter the mineral composition of the rock (that's changed by chemical weathering). So mineral composition remains unchanged.

Answer:

B. mineral composition