| A | B |
|---|
| butte | A smaller, steep hill that has a flat top and stands alone |
| delta | Deposit of earth and sand that collects at the mouth of some rivers |
| reef | A narrow ridge of rocks or coral at or near the surface of the water |
| mesa | A large, high steep hill that has a flat top and stands alone. |
| geyser | A spring that sends up fountains of jets of hot water or steam |
| dune | Amound or ridge of loose sand heaped up by the wing |
| crevasse | A deep crack or split in the surface of a glacier or the ground after an earthquake |
| desert | A region without water or trees that is usually sandy |
| silt | Very fine particles of earth or sand carried by moving water and deposited as sediment |
| lava | Hot melted rock flowing from a volcano |
| glacier | A large mass of ice formed from the snow on high ground and moving very slowly down a mountain. |
| cataract | A large steep waterfall |
| canyon | A narrow valley with high steep sides |
| spring | A small stream of water coming from the earth |
