Amplify Plate Motion Chapter 3

Front

What evidence did Alfred Wegener use to support his idea that the continents were once connected?

Back

Similar rocks, they fit like a puzzle, fossils, patterns of landforms.

Front

Where would the continents be 200 million years ago?

Back

The continents would all be together in one giant continent.

Front

What happens to the mantle as divergent plates move?

Back

It rises and adds rock to the edges of the plate.

Front

Which era was the longest, taking up 88% of geologic time?

Back

Precambrian.

Front

How fast do tectonic plates move?

Back

Plates move about 3-7 cm per year (about 2-5 inches).

Front

What is the theory of continental drift?

Back

The theory that continents have moved over geological time and were once connected.

Front

What are tectonic plates?

Back

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

Front

What is a divergent boundary?

Back

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

Front

What is a convergent boundary?

Back

A tectonic plate boundary where two plates move towards each other.

Front

What is a transform boundary?

Back

A tectonic plate boundary where two plates slide past each other.