Question

The diagram shows my neck Grover so observed along the Mid-Atlantic ridge.

How do these magnetic reversals provide evidence of the sea floor spreading?

They form oceanic trenches when crust is subected.
They form volcanic mountains chains under the ocean.
They confirm systemic activity from underwater earthquakes.
They confirm that new crust forms a long divergent boundaries.

Answer 1

[AI-generated answer — Bot GPT 3.5]

Magnetic reversals provide evidence of sea floor spreading because as new crust is formed at divergent boundaries along the Mid-Atlantic ridge, the Earth's magnetic field causes minerals in the newly formed crust to align in the direction of the current magnetic field. Over time, the Earth's magnetic field reverses direction, causing a reversal in the alignment of these minerals. This results in a pattern of magnetic stripes along the ocean floor, with alternating bands of normal and reversed polarity. These magnetic stripes provide evidence that new crust is continuously forming at divergent boundaries and spreading away from the ridge.