Continental Drift & Sea Floor Spreading

Front

What is Pangaea?

Back

A supercontinent that existed in Earth's distant past.

Front

Who is credited with the concepts of Sea floor spreading and subduction?

Back

Harry Hess.

Front

What process is demonstrated by the movement of the sea floor at mid-ocean ridges?

Back

Sea-floor spreading.

Front

Which two continents fit together most noticeably?

Back

South America and Africa.

Front

What is subduction?

Back

The process by which one tectonic plate is pulled beneath another plate.

Front

What is continental drift?

Back

The theory that continents have moved over geological time from a common landmass.

Front

What is sea-floor spreading?

Back

The process by which new oceanic crust is formed at mid-ocean ridges and older crust moves away.

Front

What evidence supports the theory of continental drift?

Back

Fossil evidence, geological similarities, and the fit of continental coastlines.

Front

What are tectonic plates?

Back

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

Front

What is a mid-ocean ridge?

Back

An underwater mountain range formed by plate tectonics.