Continental Drift and Plate Tectonics

Front

What is the area where two tectonic plates meet called?

Back

A boundary.

Front

What are the two types of crust?

Back

Continental and oceanic.

Front

According to Wegener's hypothesis of continental drift, what was the state of the continents in the past?

Back

The continents were once joined together in a single landmass.

Front

What geological feature is produced by a collision between two pieces of continental crust at a converging boundary?

Back

A folded mountain range.

Front

Why did no one believe Wegener's theory of continental drift?

Back

He could not explain HOW the continents moved.

Front

What is the theory that explains the movement of the Earth's plates?

Back

Plate tectonics.

Front

What is the name of the supercontinent that existed millions of years ago?

Back

Pangaea.

Front

What type of boundary occurs when two tectonic plates slide past each other?

Back

Transform boundary.

Front

What is the process called when one tectonic plate is forced under another?

Back

Subduction.

Front

What is the primary driving force behind plate tectonics?

Back

Convection currents in the mantle.