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Across 1. to damage something that it no longer exists or can't be used 3. a type of plant or animal may soon no longer exist 5. dirty brown air in cities that is a mixture of fog, smoke ad harmful gases 6. a tropical forest 9. the mixture of air and gases that surrounds the Earth 10. dangerous/damaging 11. damage caused to the environment by harmful chemicals and waste 12. to reuse some materials

Down 2. valuable things, such as land, water and gold 3. a type of plant or animal no longer exists 4. the air, water, and land where people, animals and plants live 7. a group of animals or plants of the same kind 8. animals and plants growing in natural conditions