The mid-ocean ridge has been created at the type of plate boundary where the sea floor is split and moving apart. out of this split magma rises, cools, and forms new sea floor. what type of boundary is this?

Will give brainliest asaap plz im in a major hurry to finish which of these pairs of objects exerts the greatest gravitational force on each other? object 1 and object 3 object 4 and object 3 object 1 and object 4 object 4 and object 2