| A | B |
|---|
| Continent | A massive land area. |
| Tsunami | Huge sea wave caused by an earthquake on the ocean floor. |
| Mantle | Layer of the earth that is about 1,800 miles thick; between the crust and the core. |
| Erosion | The process of wearing away or moving weathered material on the earth's surface. |
| Core | Center of the earth, formed of hot iron mixed with other metals. |
| Earthquake | violent and sudden movement of the earth's crust. |
| Crust | Uppermost layer of the earth. |
| Glacier | Giant, slow moving sheets of ice. |
| Plate Tectonics | The theory that states that the earth is NOT an unbroken shell but rather consists of huge slabs of rock that move. |
| Fault | A crack in the earth's crust. |
| Weathering | The natural process that breaks surface rocks into boulders, gravel, sand, and soil. |
| Magma | Hot, melted rock that sometimes flows to the earth's surface in a volcanic eruption. |
| Pangea | The "supercontinent" that is believed to have existed millions of years ago. |
| San Andreas | The most famous fault in the U.S. |
| Plate Boundaries | The place where most earthquakes and volcanoes occur. |
| The Grand Canyon | The most famous example of erosion in the U.S. |
| Acid Rain | Produced when pollution goes into the atmosphere and mixes with rain. |
