| Term | Definition |
| reservoir | Lake used for collecting and storing water |
| decade | 10 years |
| century | 100 years |
| transportation | The way something moves from one place to another |
| disaster | something that happens that causes great harm to a community |
| lodge | Homes made of logs, earth, and grass |
| tepee | Triangle-shaped shelters made of buffalo skins stretched over poles |
| legend | Stories that teach a lesson or help explain something |
| canal | Waterways built by people. |
| causeways | Roads built on soil piled up in shallow water |
| empire | All the land and people under the control of a powerful nation. |
| artifacts | A tool or a piece of jewelry. |
| archaelogoists | Scientists who look for artifacts and try to explain how they were used. |
| pollution | Vehicle exhaust and smoke from factories. |
| solutions | A way to solve a problem. |