Across
- 4. situation in which water covers land that is normally dry
- 6. to become larger in number, amount or size
- 9. describes something that can continue over time without using up resources
- 10. presence of harmful substances in the air, water or soil
- 11. situation in which something is hard to find or not available in sufficient quantities
- 17. to become too hot
- 18. something that runs on electricity rather than fossil fuels
- 19. effect or influence that an action or event has on something
- 20. conditions outside at a particular time and place
Down
- 1. knowledge or understanding of a particular issue or problem
- 2. period of unusually hot weather lasting several days or longer
- 3. to use resources such as energy, water or fuel
- 5. gases that trap heat in the atmosphere and contribute to global warming
- 7. amount of resources, goods or energy that people use
- 8. group of similar living organisms that can reproduce with one another
- 12. chemical element found in living things and some gases
- 13. measurement of how hot or cold something is
- 14. situation in which there isn't enough of something to meet people's needs
- 15. to stop being visible or no longer exist
- 16. usual weather conditions in a particular region over a long period of time