Which of the following processes physically breaks rocks and minerals into smaller and smaller pieces?
a. sedimentation
b. decomposition
c. chemical weathering
d. mechanical weathering

The vegetation that thrives in the tundra is limited to a. mosses, barley, wheat, and corn. b. coniferous trees. c. dwarf shrubs, mosses, lichen, potatoes, and beans. d. mosses, lichen, algae, and dwarf shrubs.

The chemical or mechanical process by which rock is gradually broken down eventually becoming soil

At which boundary does subduction stop occurring, resulting in a mountain range?