Characteristics of the Seafloor

Which is the first step in the seafloor spreading process?

A crack forms in oceanic crust.

Which statement describes the relationship between seafloor spreading and continental drift?

As the seafloor spreading occurs, the continents move.

Which concept is described in the theory proposed by Hess?

Mid-ocean ridges are sites of seafloor spreading.

Which statement describes the cyclic nature of seafloor spreading?

New oceanic crust is created.

Which statement accurately describes one aspect of plate tectonics that involves subduction and seafloor spreading?

Older crust is melted at subduction zones.

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

They reveal a matching pattern on either side of the ridge.

Which evidence originally supported Hess's idea of seafloor spreading in 1968?

Younger rocks are closer to mid-ocean ridges.

How does oceanic crust move along mid-ocean ridges?

away from the ridge

Which material rises from cracks in oceanic crust?

molten rock

According to the theory proposed by Harry Hess, what causes continents to move?

seafloor spreading