Which piece of land doubled the size of the United States? Florida Purchase Louisiana Purchase Mexican Cession.

Mexican Cession.

Explanation:

Well, first of all, the Louisiana Purchase and the Florida Purchase are both based in the U.S., so it would be impossible that it could be twice the size as the land in the U.S.

c. seafloor spreading occurs.

d. crust becomes molten rock.

e. denser plates slide under lighter plates.