THE EARTH DAY

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Across
  1. 2. A poisonous form of oxygen
  2. 6. Able to continue over a period of time
  3. 8. Small pieces of rubbish that have been left lying on the ground in public places
  4. 9. The natural environment in which an animal or plant usually lives
  5. 11. The air, water, and land in or on which people, animals, and plants live
  6. 12. The process of getting rid of large amounts of rubbish by burying it, or a place where rubbish is buried
  7. 13. To make new furniture, objects, etc. out of old or used things or waste material
  8. 15. The relationships between the air, land, water, animals, plants, etc., usually of a particular area, or the scientific study of this
  9. 16. Decaying plant material that is added to soil to improve its quality
  10. 18. To keep and protect something from damage, change, or waste
  11. 19. To make an area or substance, usually air, water, or soil, dirty or harmful to people, animals, and plants, especially by adding harmful chemicals
Down
  1. 1. Of or from the sun, or using the energy from the sun to produce electric power
  2. 2. Not using artificial chemicals in the growing of plants and animals for food and other products
  3. 3. The mixture of gases around the earth
  4. 4. The substances from factories, houses, etc. that go into the air
  5. 5. Renewable forms of energy can be produced as quickly as they are used
  6. 7. Not now existing
  7. 10. To sort and collect rubbish in order to treat it and produce useful materials that can be used again
  8. 14. Small pieces of rubbish that have been left lying on the ground in public places
  9. 17. To keep something as it is, especially in order to prevent it from decaying or being damaged or destroyed