| A | B |
|---|
| elevation | height above sea level |
| plain | low lying stretch of flat or gently rolling land |
| plateau | flat land with higher elevation than a plain |
| isthmus | narrow piece of land that connects 2 larger pieces of land |
| peninsula | piece of land with water on three sides |
| island | body of land smaller than a continent and surrounded by water |
| continental shelf | plateau off each coast that lies under the ocean |
| trench | valley in the ocean floor |
| strait | narrow body of water between 2 pieces of land |
| channel | body of water wider than a strait between 2 pieces of land |
| delta | area formed from soil deposited by a river at its mouth |
| core | center of the earth |
| mantle | rock layer between the core and the crust |
| magma | hot melted rock that sometimes flows in a volcanic eruption |
| crust | uppermost layer of the earth |
| continent | massive land area |
| plate tectonics | theory that the earth's crust consists of plates that move |
| earthquake | violent and sudden movement of the earth's crust |
| tsunami | huge sea wave caused by an earthquake on the ocean floor |
| fault | crack in the earth's crust |
| weathering | process that breaks surface rocks into smaller pieces |
| erosion | process of moving weathered material |
| glacier | giant slow-moving sheets of ice |
