What causes a compass to behave as it does?
a. earth’s gravity
b. earth’s shape
c. earth’s geographic north pole
d. earth’s magnetic field user: when molten material hardens into rock on the ocean floor, the domains of the iron it contains
a. disappear.
b. line up in the direction of earth’s magnetic field.
c. point in random directions.
d. never become magnetic.?

c. earth’s geographic north pole, b. line up in the direction of earth’s magnetic field.

Explanation:

A compass is a geographic tool that shows the direction aspects of the earth in all four direction and points at the direction which is in direct contact with the person. Thus on maps, the north arrow is always directed at the top. The material that cools at the surface of the earth in the mid-oceanic ridges and forms basaltic rocks that get aligned due to the magnetic properties or the presence of the iron content of the Lava and the magma. That spread n bothe the opposite edges of the oceanic ridges.