| A | B |
|---|
| plates | huge slabs of the earth's crust |
| core | the center part of the earth |
| mantle | middle layer of the earth that surrounds the core |
| faults | cracks that separate the earth's plates |
| plate tectonics | a theory about the earth's structure that states that the earth consists of moving plates |
| earthquake | a violent jolt made by sudden shifts along a fault |
| volcano | formed when magma bursts through Earth's mantle |
| glacier | giant, slow-moving sheet of ice |
| oceans | the earth's largest bodies of water |
| crust | the outer and thinnest layer of the earth |
| magma | hot melted rock that sometimes flows to the earth's surface in a vocano eruption |
| continents | the largest land areas are called... |
| tsunamis | huge waves caused by undersea earthquakes |
| weathering | a process that breaks rocks into gravel, sand, or soil |
| erosion | wearing away of the earth's surface mostly by water, wind, or ice |
| Pangaea | a super-continent of 200 million years ago |
| continental drift | theory that the continents are very slowly moving in various directions |
