Chapter 7 Plate Tectonic Review

Front

What is the ratio of land to ocean on Earth over geological time?

Back

The ratio of land to ocean changes back and forth.

Front

Where is Earth’s crust the thinnest?

Back

At a mid-ocean rift.

Front

Where is Earth’s crust the thickest?

Back

At a mountain range.

Front

What is the term for a magnetic orientation the same as that of Earth’s current magnetic field?

Back

Normal magnetic polarity.

Front

What is the theory that states the lithosphere is segmented into several plates that move relative to one another?

Back

Plate tectonics.

Front

What is the primary driving force behind plate tectonics?

Back

Convection currents in the mantle.

Front

What are tectonic plates?

Back

Large sections of the Earth's lithosphere that move and interact.

Front

What is subduction?

Back

The process where one tectonic plate moves under another and is forced into the mantle.

Front

What geological features are formed at convergent boundaries?

Back

Mountains, deep ocean trenches, and volcanic arcs.

Front

What is a divergent boundary?

Back

A tectonic plate boundary where two plates move away from each other.