Across
- 1. trash that is left lying in an open or public place.
- 4. produced without the use of chemical fertilizers, pesticides, or other artificial agents
- 9. can be used again and again.
- 14. a substance that is harmful or has poisonous effects on the environment.
- 15. an arrangement between people to make a regular trip in a single vehicle instead of each person in their own vehicle. Typically each person takes turns to drive the others on different days.
- 16. to use something as little as possible instead of continuously; to prevent something from being changed or destroyed.
- 17. one of the four spheres of earth that includes all life on earth
- 21. the production and discharge of gases into the atmosphere, especially from factories or machines (such as cars and trucks).
- 23. no living members of a species remain
- 24. the natural world as a whole; the surroundings or conditions in which a person, animal, or plant lives.
- 26. to convert or reprocess materials so that they can be used again
- 27. any gas, especially carbon dioxide, which contributes to the greenhouse effect by absorbing infrared radiation.
- 29. the natural organisms, flora, and fauna that constitute and sustain a particular area.
- 31. keep in safety and protect from harm, loss, or destruction
- 32. to not develop or change something so as to maintain it in its existing state.
- 33. the impression left by a foot or shoe on the ground or a surface
- 34. an increase in the temperature of the Earth’s atmosphere, which is due to the greenhouse effect.
- 35. a very large expanse of sea
- 36. material that is not wanted; the unusable remains or byproduct of something
- 37. The name of our planet. The third planet from the sun.
Down
- 2. seriously at risk of extinction.
- 3. the trapping of the sun’s heat in the atmosphere caused by greenhouse gases
- 5. the weather conditions in an area.
- 6. large woody plants of considerable height and branches that remove CO2 from the atmosphere.
- 7. a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances; absorbed from the air by plants in photosynthesis
- 8. one of the four spheres of earth that includes all the water on earth
- 10. harnessing of the Sun’s energy to generate electrical power.
- 11. decaying organic material used as a plant fertilizer.
- 12. one of the four spheres of earth that includes all the air on earth
- 13. a synthetic material that take a very long time to degrade.
- 18. the action of clearing a wide area of trees.
- 19. the native animals of a region.
- 20. to use something again more than once
- 22. the physical world collectively, including plants, animals, the landscape, and other features of the planet Earth that are not human creations.
- 25. decayed organic material used as a plant fertilizer.
- 28. maintaining an ecological balance by avoiding the depletion of natural resources.
- 30. fuel such as coal and oil that is formed naturally over many years from the remains of animals and plants.