How does the ocean floor preserve evidence of past magnetic reversals.
A)Mantle hot spots are always oriented to the magnetic field.
B)Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened.
C)The ocean floor is uniformly old,preserving Earthʹs 4.6 billion history.
D)Isotopic analysis of ocean core sediments help determine sea floor age and this can be used to infer past magnetism.

Question

Quizplus · Accepted Answer

Magnetic particles in basalt orient with the magnetic field in force at the time the oceanic lava cooled and hardened, creating stripes on the ocean floor that reflect a record of past magnetic reversals.

How Does the Ocean Floor Preserve Evidence of Past Magnetic