| A | B |
|---|
| asthenosphere | The layer of Earth below the top layer. It contains hot, partially melted rock with plastic-like properties. |
| convection | The process by which heat energy is transferred through liquids or gases by movement of particles. A pie in the oven is heated by this method. |
| convection current | The path along which energy is transferred. Scientists think those existing in the mantle cause Earth's tectonic plates to move. |
| convergent boundaries | A place where the Earth's plates move together, possibly causing layers of rock to bend or break. |
| divergent boundaries | A place where Earth's plates move away from one another. Most are found on the ocean floor. |
| dome mountains | A mountain formed when magma lifts Earth's surface, creating a broad dome, or bulge. Example: Pike's Peak and the Black Hills in SD. |
| fault-block mountains | A mountain formed when masses of rock move up or down along a break in the earth. Example: Grand Tetons in WY and Sierra Navadas in CA. |
| folded mountains | Mountains formed when two tectonic plates collide. Example: The Appalachain Mountians. |
| lithosphere | The top layer of Earth that is solid and rocky. It is about 100 km thick. |
| transform-fault boundaries | A place where the Eath's plates (crust and upper mantle) move past one another. These movements may cause cracks to form in Earth's rocks. |
