The theory that the continents were at one time a single landmass that broke apart and moved into the positions they are in today is called the theory of _______.

This is the name of the single, giant landmass or continent that broke apart.

________ first stated the modern theory of continental drift.

Alfred Wegener supported his theory of continental drift by showing how the continents________ like a puzzle.

The _______ of once-living organisms on more than one continent also supports the theory of continental drift.

This is an ocean-floor feature resembling a mountain range on land.

This is a flat area between two ridges that is formed by spreading plates.

In the ocean, when magma rises through the crust, it cools and forms new crust on both sides of a rift. What is this process called?

On the ocean floor, there are deep canyons called _____.

The areas in which oceanic crust is forced back down into ocean trenches are called _____.

This is a large, solid piece of Earth's surface.

This is the theory that Earth's crust is broken into plates that float on the upper part of the mantle.

This is the movement of a gas or liquid caused by changes in temperature.

This is the place where two tectonic plates meet.

When two tectonic plates slide past each other, it's known as a ________.

When two tectonic plates move away from each other, it's known as a __________.

When two tectonic plates push toward each other, it's known as a _______.

The San Andreas fault line in California is an example of what kind of plate boundary?

Fossils of the freshwater Mesosaurus have been found in both Africa and South America. Since the mesosaurus couldn't swim in the salty water, this is evidence for what theory?

The word Pangaea means ____________.

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