| A | B |
|---|
| border | An imaginary line on a map. |
| conservation | The careful use of natural resources. |
| economy | The way people use or produce goods and services. |
| environment | The surroundings in which people live. |
| glacier | A huge, moving sheet of ice. |
| mouth | The place where a river empties into a larger body of water. |
| natural resources | Something found in the Earth that people can use. |
| plain | A type of landform that is nearly flat. |
| population | The number of people living in an area. |
| port | A place where ships load and unload goods. |
| geography | The study of Earth and all the things that live on it. |
| landform | One of the shapes that make up the surface of the Earth. |
