Weather and the environment

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Across
  1. 5. A container of water (6)
  2. 7. The part of a plant or tree that grows under the ground and gets water from the soil (4)
  3. 8. the Earth (10)
  4. 10. A measure of how hot or cold a place or thing is (11)
  5. 11. a light cloud low over the ground that makes it difficult for you to see very far (4)
  6. 13. Cold _ _ _ _ A period of unusually cold weather (4)
  7. 14. the natural home of a plant or animal (7)
  8. 16. A scientist who studies the way in which plants, animals and people are related to each other and to their environment (9)
  9. 17. _ _ _ _ _ _ _ _ _ energy. Energy that replaces itself naturally or is easily replaced because there is a large supply of it (9)
  10. 18. Weather _ _ _ _ A metal object fixed to the top of a building that blows around to show the direction the wind is coming from (4)
  11. 19. waste paper, cans etc. that people have thrown away and left on the ground in a public place (6)
Down
  1. 1. A layer of gases in the sky that prevents harmful radiation from the sun from reaching the Earth
  2. 2. _ _ _ _ _ _ _ _ _ _ gas. A gas, especially carbon dioxide or methane, that is thought to trap heat
  3. 3. A very small amount of rain that falls in a round shape: a rain _ _ _ _ (4)
  4. 4. someone who works hard doing practical things to achieve social or political change (8)
  5. 6. a liquid used to supply power to the engine of a car or other vehicles (6)
  6. 8. to continue without causing damage to the environment (11)
  7. 9. An area of countryside or land of a particular type, used especially when talking about its
  8. 12. A period of unusually hot weather, especially one that continues for a long time (8)
  9. 13. A small ball of frozen rain (5)
  10. 15. (9)