Plate Tectonics - Continental Drift

Front

Who proposed the theory of continental drift?

Back

Alfred Wegener

Front

What was the name of the supercontinent that existed 250 million years ago?

Back

Pangea

Front

What type of boundary occurs when crust is neither created nor destroyed?

Back

Transform boundary

Front

What type of boundary is the San Andreas Fault in California?

Back

Transform boundary

Front

What evidence do glacier scars in Africa provide?

Back

Africa was once in an area of the Earth that had a very cold climate.

Front

What is the main idea of the theory of continental drift?

Back

The continents were once joined together and have since drifted apart.

Front

What geological feature is formed at convergent boundaries?

Back

Mountains or deep ocean trenches.

Front

What is a divergent boundary?

Back

A boundary where two tectonic plates move away from each other, creating new crust.

Front

What is sea floor spreading?

Back

The process by which new oceanic crust is created at mid-ocean ridges.

Front

What is the significance of the Mid-Atlantic Ridge?

Back

It is a divergent boundary where the Eurasian and North American plates are moving apart.