Across
- 4. A change in the Earth's climate
- 5. Continuous movement of water due to natural processes e.g. wind
- 6. Increase of temperature in the atmosphere
- 8. The cycle between living and non-living environments
- 12. Life in the world or habitat or ecosystem
- 15. Natural fuel
- 17. Layers of soil and rock that remains frozen throughout the year
- 19. The main basic of natural gas
Down
- 1. All living things
- 2. Land masses on the Earth
- 3. Time between glaciations
- 7. The state of the atmosphere
- 9. Colourless and odourless gas, produced by burning carbon or organic substances
- 10. Averages of weather conditions on a long term basis
- 11. All the liquid of water on the Earth's surface
- 13. A community of living and interacting organisms and their environment
- 14. Be maintained at a certain rate or level
- 15. Prehistoric organisms remains
- 16. A spiral of ocean currents in the major oceans
- 18. Layers of gases around the planet