The symmetrical pattern of magnetic polarities about spreading ridges in oceanic crust basalts
indicates that:a.
each plate has had an independent set of magnetic reversals.
b. basalt retains its magnetic signature for only a few million years.
c. new ocean crust is created by volcanism at oceanic ridges and old crust moves laterally
away from the ridge.
d. the oceanic crust is geologically young.
e. magnetic polarity reverses but northern and southern hemispheres do not.
C
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