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.
The correct answer is letter b. line up in the direction of Earth s magnetic field. When molten material hardens into rock on the ocean floor, the domains of the iron it contains it lines up in the direction of Earth s magnetic field.
