| A | B |
|---|
| Divergent Boundary | When two plates move apart from one another. |
| Convergent Boundary | When two plates move towards one another. |
| Transform Fault | When two plates slip past one another. |
| Mountains | These are formed when two continental plates collide. |
| Volcanoes | These are formed at convergent and divergent boundaries as well as hot spots. |
| Lithosphere | The crust and the top part of the mantle. This area is ridgid and breaks into pieces called plates. |
| Asthenosphere | The putty like layer which consist of the bottom half of the mantle. |
| Inner core | A solid layer of the earth that consist of Iron and Nickle. |
| Outer core | A liquid layer of the earth that consist of Iron and Nickle. |
| Mantle | A plastic like layer of the earth that consist of Iron, Magnesium, Silcon, and Oxygen. This is the thickest layer. |
| Crust | The outer most layer of the earth. |
| Pangaea | A supercontinent once thought to exist about 250 million years ago. |
| Continental Drift Theory | Alfred Wegener's theory that states there once was one supercontinent called Pangaea. |
| Sea-Floor Spreading | The hypothesis that states molten material from the Earth's mantle is forced up to the surface at mid-ocean ridges and cools to form new seafloor. |
| Magnetometer | The tool used to take magnetic readings of the ocean floor igneous rocks and plotted the data on maps. |
| Plate tectonics | The most current theory of how plates move. |
| North American Plate | The lithospheric plate that the North American continent is found on. |
| California | A location in the United States where the Juan de Fuca Plate and the North American Plate are sliding past one another. This create earthquake activity on the coast of this state. |
| Convection currents | The currents caused by the rising of warm magma which cools and sinks. This is thought to be the mechanism behind plate movement. |
| Glossopteris | A fossil fern found on many different continents. This was one of Wegener's bits of evidence for his Continental Drift theory. |
