What technology did scientists use in the mid-1900s to map the mid-ocean ridge?

In sea-floor spreading, molten material rises from the mantle and erupts

Most geologists think that the movement of Earth’s plates is caused by

The geological theory that states that pieces of Earth’s lithosphere are in constant, slow motion due to convection currents in the mantle, is the theory of

A place where two plates slip past each other, moving in opposite directions, is known as a: (San Andreas Fault is a good example)

A collision between two pieces of continental crust at a converging boundary produces a

The Ring of Fire is an example of which kind of boundary?

A rift valley forms when a ____________________ boundary forms on land.

Sea-floor rocks near the ridge is _______________ than sea-floor rocks that are further away.

How many earthquakes occur in Alaska each month?

What element has been used to help understand the magnetic reversal of the ocean floor?

This process is credited for continually adding new crust to the ocean floor.

Lithospheric plates float on top of the __________________________.

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