Across
- 4. a change or result that is caused by something
- 5. to keep someone or something safe from something dangerous or bad
- 7. dioxide a gas formed when people or animals breathe out, or when carbon is burned
- 10. the natural surroundings of living things, such as the air, land, or sea
- 11. to set someone or something free
- 12. injury, damage, or problems caused by something that you do
- 13. someone or something that makes something happen
- 17. to make something less
- 18. an amount of liquid that has accidentally flowed out of a container
- 19. a place where waste is buried in the ground
- 20. a gas in the air that has no smell or taste, and that all animals depend on to breathe
- 21. very sour; containing acid or consisting of an acid
- 23. to get rid of something; to deal with and finish something
- 24. to use something completely
- 25. to put something somewhere to get rid of it
- 26. to make water, air, soil, etc dirty or harmful
- 29. to use paper, glass, plastic, etc again and not throw it away
Down
- 1. to keep something from happening
- 2. a large area of trees growing closely together
- 3. to cause a change in someone or something
- 6. a poisonous form of oxygen that exists high in the Earth's atmosphere
- 8. smelling clean or feeling pleasantly cool; clearly new and different
- 9. to cause someone or something to be in a dangerous situation
- 14. one of two or more things that you can choose between
- 15. animals, birds, and plants living in their natural environment
- 16. a building made of glass for growing plants in
- 22. a substance that is used to provide heat or power
- 23. to harm or break something
- 27. things that you throw away because you do not want them
- 28. to prevent something from being damaged or destroyed