Only 3 questions plz answer 3. Continental drift is the idea that .

A. objects that fall into the ocean drift between the continents.
B. the continents are the only solid surface on the earth.
C. ocean waves push the continents over the surface of the earth.
D. the continents were once joined together to form a large land mass and have moved.

4.Plate tectonics refers to the theory that .

A. each of the continents on the earth is also called a plate.
B. the surface of the earth is made of large plates that cannot move.
C. the surface of the earth is made up of large plates that have moved over time.
D. the continents float on the oceans like plates.

5.What caused the caves and sinkholes we have here in Southern Indiana?

A. glaciers scraped the land flat
B. acids in the water dissolved limestone away
C. erosion made valleys