| A | B |
|---|
| mid-Atlantic ridge | A mid ocean ridge in the Atlantic. |
| Molten Rock | Magma. |
| Pangea | The single giant land mass that once contained all the continents. |
| Ring of Fire | The Earthquake and volcanoe zone that encircles the Pacific Ocean. |
| Convergent Boundarys | Plate Boundarys that come thogether. |
| dinergent Boundarys | Plate boundarys that go apart. |
| Mantle | The layer of Earth that Extends From the bottom of the crust to the core. |
| Fault | A break or crack in earth's crust olong which rooks move. |
| Magma | Molten rock that is under earth's surface. |
| Ocean floor Spreading | The process in which old ocean floor is pushed away from a mid ocean ridge by the formation of new ocean floor. |
| Convection Currents | A movement of material caused by differences in temperature. |
| Hot Spots | Spots under earth's crust that are hotter that the rest. |
| Trench | A vshaped valley on the ocean floor where old ocean floor is subducted |
| Lithospheric plate | The top most solid part of the earth, made of the crust, and some of the mantle |
| Seismograph | An Instroment that detects and measures the seismic waves of earthquakes. |
| Richer Skale | The scale used to measure the streingth of earthquakes. |
| Midocean Ridge | An undersea mountain chain where new ocean floor is produced. |
