Marine magnetic anomalies are now known to have developed because
A.magnetic reversals were finally shown to be a consequence of variations in the orientation of the earth's magnetic field lines relative to the equator.
B.there are linear strips of iron ore embedded in the seafloor as a consequence of sea-floor spreading.
C.movement at convergent margins tends to distort the earth's magnetic field over broad distances.
D.different strips of seafloor formed at different times on an earth whose magnetic polarity occasionally reverses through geologic time.
E.movement of the continents relative to the magnetic field.
