| A | B |
|---|
| altitude | the height of an area measured from sea level |
| canal | waterway made by man to use for transportation or irrigation |
| continent | large land masses we divide the earth into |
| dune | a hill made of sand and shaped by wind |
| equator | an imaginary circle around the middle of the earth |
| desert | a very dry area with few plants or grass |
| geography | the study of the surface of earth |
| island | a piece of land surrounded by water |
| marsh | a type of wetland along rivers or lakes or coast with plants growing from the water |
| mountain | a very tall natural part of earth with steep sides and sharp peaks |
| oasis | a place in the desert that is fertile because it has water |
| ocean | a large body of salt water that surrounds a continent |
| peninsula | a body of land that is surrounded by water on three sides |
| prairie | a wide flat area of land that has grass but not many trees |
| reservoir | a lake made by man to store water for future use |
| river | a large flowing body of water that empties into a lake or sea |
| source | the beginning of a river |
| swamp | a freshwater wetland with muddy land and many trees and bushes |
| tropics | the warm region on either side of the equator |
| waterfall | a place where a river falls off very suddenly and steeply |
| valley | a low area of land between mountains |
| volcano | an opening in the top of a mountain that sometimes erupts with hot gases and lava |
