sea-floor spreading 9.2

Sonar is a device that scientist use to map the ocean floor.

Which feature forms the longest mountain ranges on Earth?

The pattern of magnetic stripes in rocks on either side of mid-ocean ridges is the same.

Where does subduction occur?

Molten material erupts inside the central valley of mid-ocean ridges.

A deep-ocean trench is an underwater mountain.

Which process or processes change the size and shape of the oceans?

Sea-floor spreading occurs at mid-ocean ridges.

Which process adds more crust to the ocean floor?

The farther from the mid-ocean ridge a rock sample is taken, the younger the rock.