The specific magnetism of basalt rock is determined by the Earth's magnetic field when the magma is cooling. Scientists determined that the same process formed the perfectly symmetrical stripes on both side of a mid-ocean ridge. ... Oceanic crust slowly moves away from mid-ocean ridges and sites of seafloor spreading.
I Think The answer is d I hope it helps just Trying To help others That I can
C!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
