Vocabulary
Key Concepts
Plate Boundaries
100

Earth’s outermost layer of hard, solid rock that is underneath the soil, vegetation, and water.

What is the outer layer or crust?

100

Earth's outer layer is divided into sections called ____________.

What are plates?

100

Two plates move away from each other.

What is divergent?

200

A diagram that shows what the inside of something looks like.

What is a cross section?

200

The plates of Earth's outer layer __________________.

What is move?

200

Two plates move toward each other.

What is convergent?

300

An underwater mountain range formed when two plates move apart.

What is a mid-ocean ridge?

300

Earth's plates move on top of a soft, solid layer called the __________________.

What is the mantle?

300

The type of boundary that lies between South America and Africa.

What is divergent boundary?

400

A long, deep indentation in the ocean floor formed when two plates move together

What is a trench?

400

If you removed all the vegetation, soil, and water from the surface of the earth this would be left.

What is hard, solid rock?

400

A mid-ocean ridge forms at this plate boundary.

What is divergent?

500

An extinct reptile that lived about 300 million years ago.

What is Mesosaurus?

500

At divergent plate boundaries, rock rises from the mantle and _______, adding new solid rock to the edges of both plates.

What is hardens?

500

A trench forms at this plate boundary.

What is convergent?