| A | B |
|---|
| coastal plain | low land that lies along an ocean |
| peninsula | land almost entirely surrounded by water |
| basin | low, bowl shaped land with higher ground around it |
| canyon | deep, narrow valley with steep sides |
| mountain range | a group of connected mountains |
| fertile | rich land, good for growing crops |
| plateau | high, mostly flat land |
| groundwater | water beneath the earth's surface |
| source | place where a river begins |
| channel | deepest part where a river begins |
| mouth | the place where a river empties into some larger body of water |
| tributary | stream or river that flows into a larger stream or river |
| river system | a river and its tributaries |
| drainage basin | the land drained by a river system |
| erosion | the wearing away of the Earth's surface by water, wind etc. |
| floodplain | the low, flat land along a river |
| delta | the triangle-shaped land at the mouth (end) of the river |
| levee | a high wall made of the earth and built along the banks of a river to help control flooding |
| dam | a wall built across a river to hold back water |
| elevation | the height of the land |
| sea level | land that is level with the surface of the ocean |
| relief | differences in the land elevation |
| downstream | toward the river's mouth |
| upstream | towards the river's source |
| precipitation | water that falls to the Earth's surface, such as rain, snow, sleet, hail |
| axis | an imaginary line that runs through the Earth from the North Pole to the South pole;the Earth spins, or rotates around its axis |
| rotation | one completeturn of the EAth on its axis;one rotation takes one day, or 24 hrs.; rotation causes day and night on Earth |
| revolution | one trip, or orbit,of the Earth around the sun;The Earth takes one year, or 365 days, to make on complete revolution around the sun |
| humidity | the amount of moisture in the air |
| product | something that people make or grow, usually to sell |
| mineral | a natural substance found in rocks, such as iron ore |
| fuel | a natural resource used to make heat or energy, such as coal,oil, natural gas |
| natural resource | anything made by nature that we can use (trees,water,air) |
| human resources | workers and the ideas and skills that they bring to their jobs |
| manufacturing | the making of goods, often in a factory |
| service | an activity that people do for others, such as caring for their health, fixing cars |
| economy | the way people in a state, region, or a country use resources to meet their needs |
| land use | how most of the land in a place is used |
| adapt | to change in order to make more useful |
| conservation | protecting our natural resources and using them wisely |
| scarce | limited in amount; very little |
| recycle | use things again |
| pollution | anything that makes a natural resource dirty or unsafe |
