| A | B |
|---|
| highlands | a mountainous part of a country |
| plateau | a raised area of land, such as a hill or mountain with a flat top |
| desert | a geographic region with too little rainfall to support much plant life; also a vegetation zone |
| river basin | the area drained by a river and its tributaries |
| water cycle | the movement of water from the surface of Earth to the atmosphere and back again |
| silt | sand, mud, or clay made up of fine bits of soil and found at the bottom of a river or lake |
| perennial irrigation | a system that allows for the year round watering of crops |
| hydroelectric potential | the electrical power that can be generated from the moving of water |
| evaporation | the process by which a liquid, such as water, turns into a vapor or gas |
| water vapor | the water in the form of a gas, as in steam or moisture in the atmosphere |
| condense | to lose heat and change from a vapor or gas into a liquid. |
| infiltration | the movement of water from Earth's surface into the soil |
| runoff | water from rain fall that is not absorbed into the soil and instead flows into streams or lakes |
| headwaters | the stream or streams that make up the beginnings of a river |
| confluence | the flowing together of 2 or more streams |
| cataracts | a series of rapids and low waterfalls on a river |
| wadi | the usually dry bed of a river or stream in a desert or semiarid area |
| reservoir | an artificial lake where water is stored |
| delta | the triangle-shaped deposit of sand and sediment that occurs where a river flows into an ocean |
| savanna | a type of tropical grassland |
| chaparral | a vegetation zone of mainly small trees and brush adapted to a mediterranean climate; also refers to the type of vegetation in this zone |
| nomadic herding | the raising of livestock for food by moving herds from place to place to find pasture and water |
| oasis | an isolated spot in a desert where water is found |
