Question

How do magnetic stripes of iron in ocean rock provide evidence of seafloor spreading?

They show when Earth's poles reversed.
They show how the density of the seafloor has changed.
They reveal a matching pattern on either side of the ridge.
They reveal differences in the mineral composition of newly created rock.

Answer 1

Answer:

Scientists discovered that the rock that makes up the ocean floor lies in a pattern of magnetized “stripes.” These stripes hold a record of reversals in Earth's magnetic field. ... As the rock cooled, the iron bits inside lined up in the direction of Earth's magnetic poles.

Answer 2

Answer: They reveal differences in the mineral composition of newly created rock.

Explanation: