The shell of rigid rock that makes up the earth's crust and the outer most part of the mantle is called the

What is associated with mid-ocean ridges?

What is an additional type of erosion found at the coast? what does it mean?

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.