What processes below are involved in the early stages of the formation of an ocean basin by sea floor spreading?

unwraping and crust bulges/thins

Explanation:

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

Answer barren with few trees, in the northern hemisphere;