Over the last 250 million years, the world changed from a single land mass to a number of different continents. one reason for the change is expanding ocean floors. what causes ocean floors to expand?

a)convergent plates
b)divergent plates
c)slab pull
d)uplift

What is a small water source like a stream or brook?

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.

What must happen for new french words to be published in official dictionaries? a. they must be approved by the french academy b. they must be voted on by the people of france c. they must be used by famous french writers d. they must be used by philosophers a. they must be approved by the french academy