the process that continuously adds rock to the seafloor

when two plates move past each other

when two plates move in opposite directions

when two plates come together

A force that pushes rock or rock material in opposite directions

a force that stretches rock so that the weaker part becomes thinner, divergent

force that pushes two things together, convergent

a process that results in a change in the rock's shape or volume

The result of the movement of rock beneath Earth's surface

a force that acts on rock to change its shape or volume. The force adds potential energy to the rock. When the energy exceeds the rock's ability to hold onto, the rock breaks or changes its shape.

the area where magma comes out of

where old rocks fall into and become parts of the mantle. this is where subduction occurs.

tools that are used to send out echowaves. those echowaves are mapped and the distance is measured.

molten rocks that lie on the seafloor

the samples of the seafloor were obtained by drilling

the pattern of the rocks that lay on the seafloor

Harry Hess believed that the Continental Drift theory could work if seafloor spreading tied into it.

Scientists used a submarine to get rocks from a mid-ocean ridge. The rocks showed that melted rock had hardened again and again along the ridge.

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See image

See image

See image

See image

Subduction is the process in which the ocean floor sinks back into the mantle at the deep ocean trench or the trench.

The pacific ocean is becoming smaller because more subduction is taking place because more trenches are in place.

The atlantic is becoming bigger because there are less trenches and more mid ocean ridges.

Convection

The lithosphere is broken into several pieces or sections called plates. These plates fit closely together and are in constant slow motion, driven by convection currents.