In addition to ice and running water, common agents of mechanical weathering are?

Question

a. radioactivity, animals, and humans.

b. gravity, wind, and plants and animals.

c. sunlight, gravity, and wind.

d. erosion, gravity, and farming.

Answer 1

b. gravity, wind, and plants and animals.

Radioactivity is very uncommon when it comes to physical (mechanical weathering)

Sunlight doesn't erode much

Erosion incorporates both Chemical and Mechanical weathering.

Hence it has to be b.  

Wind erodes via abrasion, animals by compations and disruption and gravity via mass wasting.

-pph

Answer 2

b.