In which direction or directions do seafloors spread? a. north and south parallel to mid-ocean ridges b. inward toward the mid-ocean ridges c. outward away from the mid-ocean ridges d. north on the east side of the mid-ocean ridge and south on the west side of the ridge

Sea floors spread in the outward direction, away from the mid-ocean ridges. A mid-ocean ridge is a series of mountain ranges underwater that are formed by plate tectonics.

It is the doctrine that the us had the right and duty to expand throughout north america. it just means they believed they had the right to expand westward and they did! they stated with the 13 colonies and then they kept moving gaining different territories throughout the years