| A | B |
|---|
| source | starting point. The place where a river begins |
| mouth | The place where a river empties into an ocean, a lake, or a 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 where 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 a certain place. |
| cash crop | A crop that is grown to be sold for money rather than to be used on the farm where it is grown. |
| tourists | A person traveling on vacation |
| cause | An event that makes something else happen. |
| effect | An event that happens as a result of another event. |
| industry | All the businesses that make one kind of goods or provide on kind of service. |
| coal | A mineral found under Earth's surface that is burned as a 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. |
| outline | A plan for organizing written information about a subject. |
| fertile | Good for growing crops. |
| irrigation | The use of ditches or pipes to bring water to fields. |
| dam | A wall built across a river to control the flow of water or create a lake. |
| hydroelectric power | Electricity made from flowing water in rivers. |
