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;

They reveal a matching pattern on either side of the ridge

Explanation; Sea-floor spreading occurs when the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them. Several types of evidence supported Hess's theory of sea-floor spreading, these includes; eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves. Magnetic stripes in the rock of ocean floor reveal a matching pattern on either side of the ridge and this provides evidence of sea floor spreading.

Answer:They reveal a matching pattern on either side of the ridge

Explanation;

Sea-floor spreading occurs when the sea floor spreads apart along both sides of a mid-ocean ridge as new crust is added. As a result, the ocean floors move like conveyor belts, carrying the continents along with them. Several types of evidence supported Hess's theory of sea-floor spreading, these includes; eruptions of molten material, magnetic stripes in the rock of the ocean floor, and the ages of the rocks themselves. Magnetic stripes in the rock of ocean floor reveal a matching pattern on either side of the ridge and this provides evidence of sea floor spreading