Across
- 3. a gas which forms a layer between the troposphere and stratosphere
- 6. combination of smoke and fog
- 9. formation of deserts in arid and semi-arid regions due to changes in climate and overgrazing
- 11. gases that are released mainly from air-conditioning systems and refrigeration
- 12. energy derived from magma
- 13. energy derived from the sun
- 14. a poisonous chemical that was used to protect plants from harmful insects
Down
- 1. a change in climate which is attributed directly or indirectly to human activity that alters the composition of the global atmosphere
- 2. oil, coal and natural gas
- 4. a change in the physical, chemical or biological conditions of the environment which harmfully affects the quality of life of all organisms
- 5. destruction of forest
- 7. phenomenon that occurs when dinoflagellates increase in number tremendously causing seawater to discolor
- 8. energy created when nuclei of atoms are split apart
- 10. unwanted sound
- 11. weather pattern of a place over a long period of time