Regions of the sea floor with negative magnetic anomalies were formed during times when Earth's magnetic field ________.
A)was exceptionally strong
B)was exceptionally weak
C)had normal polarity
D)had reversed polarity

Question

Quizplus · Accepted Answer

Negative magnetic anomalies on the sea floor are formed when rocks on the ocean floor solidify and align with the direction of Earth's magnetic field. When the magnetic field reverses, the rocks solidifying at that time will have the opposite alignment, resulting in negative magnetic anomalies. Therefore, the correct answer is D) had reversed polarity.

Regions of the Sea Floor with Negative Magnetic Anomalies Were