| A | B |
|---|
| volcano | an opening in earth’s surface through which gases and lava escape from the earth’s interior |
| island | a body of land surrounded by water |
| strait | a narrow strip of water connecting two large bodies of water |
| swamp | an area of land that is saturated by water |
| flood plain | flat land alongside a river, formed by mud and silt deposited by floods |
| River mouth | the place where a river flows into a lake or a ocean |
| sea level | the level of the ocean’s surface, used as a reference point when measuring heights and depths on the earth’s surface |
| bay | part of an ocean or a lake partially enclosed by land |
| cape | a pointed piece of land extending into and ocean or lake |
| harbor | a sheltered are of water , deep enough for the docking ships |
| marsh | soft ,wet, low-lying, grassy area located between water and dry land |
| delta | a triangular area of land formed from deposits at the mouth of the river |
| butte | a raised, flat area of land with steep sides, smaller than a mesa |
| oasis | a spot of fertile land in a desert, supplied with water by a well spring |
| desert | a dry area where few plants grow |
| mesa | a wide, flat-topped mountain with steep sides, larger than a butte |
| prairie | large, level area of grassland with few or no trees |
| mountain | natural elevation of earth’s surface with steep sides, higher than a hill |
| steppe | a wide, treeless plain |
| canyon | deep , narrow valley with steep sides |
