Across
- 3. To keep something in a position without letting it fall or move away
- 6. A community of living things and the non-living things around them that work together
- 9. Things that do not have life, such as rocks, water and air
- 12. Things that have life, such as plants, animals and people
- 14. Large areas of land covered with many trees and different kinds of living things
Down
- 1. High, large natural hills of rock that rise above the surrounding land
- 2. To keep something in a particular place so that it can be used later
- 4. A gas in the air that all living things need to breathe and stay alive
- 5. To go back to a place where you were before
- 7. The usual weather conditions in a particular place over a long period of time
- 8. To make something free from something unwanted
- 10. The large areas of salt water that cover most of the Earth's surface
- 11. Areas of land that are often covered with water and have special plants and animals
- 13. A small area of water that is surrounded by land
- 15. A simple water-living thing with a soft body, which can clean water by taking in small particles