| A | B |
|---|
| volcano | a type of mountain that has an opening at the top through which lava flows |
| erupt | to burst out |
| lava | hot, melted material that comes out of a volcano |
| magma | hot, melted rock and gases deep inside the earth |
| earthquake | a shaking or sliding of the surface of the earth |
| landform | a shape on the earth's surface |
| plain | a large, flat area of land |
| plateau | a large, flat area of land that is high |
| coast | a place where the ocean and land meet |
| valley | low area between mountains or hills |
| hill | high ground with rounded tops |
| cliff | steep wall of rock or soil |
| weathering | breaking apart and changing of rocks |
| erosion | carrying away of weathered rocks or soils by water, wind, or other causes |
| glacier | a huge amount of moving ice |
