| Term | Definition |
|---|
| atoll | a ring of coral that encloses a pool of seawater |
| isthmus | a narrow strip of land that connects two larger land areas |
| fjord | a long narrow inlet of the sea between cliffs or slops |
| geyser | A fountain of water and steam that erupts from the ground |
| volcano | a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt |
| archipelago | a group of many islands in a large body of water |
| badlands | contain irregular cliffs and colorful hills striped with gray, white, and red rock; Indians called it Mako Sica, meaning "bad lands" |
| bay | a body of water that is partly enclosed by land |
| beach | an area of sand sloping down to the water of a sea or lake |
| butte | n. A conspicuous hill, low mountain, or natural turret, generally isolated. |
| canyon | a deep valley with steep sides often carved from the earth by a river |
| cape | a strip of land projecting into a body of water |
| cave | an underground enclosure with access from the surface of the ground or from the sea |
| channel | a deep and relatively narrow body of water (as in a river or a harbor or a strait linking two larger bodies) that allows the best passage for vessels |
| cliff | steep, high wall of rock, earth, or ice |
| jungle | an impenetrable equatorial forest |
| lagoon | a body of water cut off from a larger body by a reef of sand or coral |
| lake | a body of (usually fresh) water surrounded by land |
| marsh | low-lying wet land with grassy vegetation |
| mesa | broad, flat-topped landform with steep sides; smaller than a plateau |
| mountain | a land mass that projects well above its surroundings |
| ocean | one of the four major bodies of salt water that surround the continents |
| peninsula | a large mass of land projecting into a body of water |
| plain | area of level land, usually at low elevation and often covered with grasses |
| plateu | a large raised area of mostly level land |
| prairie | a treeless grassy plain |
| continent | one of the large landmasses of the earth |
| delta | A landform made of sediment that is deposited where a river flows into an ocean or lake |
| desert | an arid region with little or no vegetation |
| dune | a ridge of sand created by the wind |
| forest | the trees and other plants in a large densely wooded area |
| glacier | a slowly moving mass of ice |
| gulf | an arm of a sea or ocean partly enclosed by land |
| hill | elevated land with sloping sides and rounded summit; generally smaller than a mountain |
| iceberg | a large mass of ice floating at sea |
| island | a land mass (smaller than a continent) that is surrounded by water |
| river | a large natural stream of water (larger than a creek) |
| sea | a division of an ocean or a large body of salt water partially enclosed by land |
| sound | a narrow channel of the sea joining two larger bodies of water |
| strait | narrow stretch of water joining two larger bodies of water |
| swamp | low land that is seasonally flooded |
| tundra | a vast treeless plain in the arctic regions between the ice cap and the tree line |
| valley | a long depression in the surface of the land that usually contains a river |
| waterfall | a steep descent of the water of a river |
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