| A | B |
|---|
| source | the place where a river begins |
| mouth | the place where a river empties into an ocean, lake, or larger river |
| tributary | any river that flows into another larger river |
| river basin | all the land that is drained by a river and its tributaries |
| port | a place where ships load and unload their goods |
| delta | land formed by the soil that a river deposits as it flows into a larger body of water |
| wetland | an area such as a swamp or marsh whre water is at or close to the surface of the ground |
| agriculture | the business of growing crops and raising animals |
| growing season | the time of the year when the weather is warm enough for crops to grow in certain places |
| cash crop | a crop that is grown to be sold for money rather than to be used on the farm where it is grown |
| tourist | a person traveling on vacation |
| cause | something that makes something else happen |
| effect | an effect that happens as a result of another event |
| industry | all the businesses that make one kind of goods or provide one kind of service |
| coal | a mineral found under the Earth's surface that is burned as fuel |
| labor union | a group of workers organized to get better working conditions |
| technology | the use of skills, ideas, and tools to meet people's needs |
