Front

What is the process by which the ocean floor sinks beneath a deep-ocean trench and back into the mantle?

Back

Subduction.

Front

Where would the oldest rock be found in relation to tectonic plates?

Back

At the continental crust, typically farthest from mid-ocean ridges.

Front

Which layer of Earth is the thickest?

Back

Mantle.

Front

What is the primary cause of the movement of Earth’s plates?

Back

Convection.

Front

What type of plate boundary is represented by the Himalayas in Asia?

Back

Continent-to-continent convergent.

Front

What is the term for the movement of tectonic plates away from each other?

Back

Divergent boundary.

Front

What is the layer of Earth that is solid and composed mainly of iron and nickel?

Back

Inner core.

Front

What is the term for the theory that explains the movement of continents over geological time?

Back

Continental drift.

Front

What geological feature is formed at a convergent boundary where an oceanic plate meets a continental plate?

Back

Subduction zone.

Front

What is the process called when two tectonic plates slide past each other?

Back

Transform boundary.