3
QuizMultiple Choice

Volcanoes — Unit test

Question 3 • DRHS GA-GSE Earth Systems

What is the orientation of the magnetic stripes of iron contained in rocks that support the idea of seafloor spreading?

Answer
A
east and west
B
north and east
C
south and west
D
north and south

Explanation

Iron-bearing minerals in cooling seafloor rocks align with Earth’s magnetic field. The field’s direction is recorded as alternating bands of normal and reversed polarity, oriented roughly north–south and parallel to mid-ocean ridges. This magnetic stripe pattern supports seafloor spreading.

AI-written and checked against the verified answer.

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