| A | B |
|---|
| mouth | The place where a river empties into the ocean or another body of water. |
| agriculture | The business of growing crops and raising animals. |
| labor union | A group of workers who push for better working conditions. |
| industry | All the businesses that make one kind of goods or provide one kind of service. |
| technology | The use of skills, ideas, and tools to meet people's needs. |
| source | The starting point of a river |
| wetland | An area, such as a swamp or a marsh from which water does not always drain away. |
| river basin | The land that is drained by a river and its tributaries. |
| coal | A black or brown rock that is found in the Earth and gives off heat when it is burned. |
| port | A place where ships load and unload their goods. |
