The Symmetrical Pattern of Magnetic Polarities About Spreading Ridges in Oceanic

question 53

Multiple Choice

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 generated by volcanism at oceanic ridges and old crust moves laterally away from the ridge and is subsequently destroyed via the process of subduction.
• D) the oceanic crust is geologically young.
• E) magnetic polarity reverses but northern and southern hemispheres do not.

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