How Does the Ocean Floor Preserve Evidence of Past Magnetic

question 74

Multiple Choice

How does the ocean floor preserve evidence of past magnetic reversals?

• A)Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened.
• B)Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.
• C)The ocean floor is uniformly old,preserving the Earth's 4.6 billion history.
• D)Mantle hot spots are always oriented to the magnetic field.
• E)The oldest oceanic crust is always found near mid-ocean ridges.As one moves out from these ridges,the crust is simultaneously younger and oriented according to the polarity at the time.

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