ENVIRONMENT

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Across
  1. 3. able to decay naturally and in a way that is not harmful
  2. 10. the natural environment in which an animal or plant usually lives
  3. 13. the process by which land changes into desert, for example because there has been too much farming activity on it or because a lot of trees have been cut down
  4. 15. the general weather conditions usually found in a particular place
  5. 16. in danger of being harmed, lost, unsuccessful
  6. 17. the process by which land or buildings sink to a lower level
  7. 18. a large amount of ice, snow, and rock falling quickly down the side of a mountain
  8. 21. a substance that causes cancer
  9. 22. a substance that makes something less pure or makes it poisonous
  10. 24. the business of organizing holidays to places of natural beauty in a way that helps local people and does not damage the environment
  11. 25. of or connected with the heat inside the earth
  12. 26. the number and types of plants and animals that exist in a particular area or in the world generally, or the problem of protecting this
  13. 27. the cutting down of trees in a large area, or the destruction of forests by people
Down
  1. 1. an occasion when a volcano explodes, and flames and rocks come out of it, or the act of doing this
  2. 2. a person who studies the natural relationships between the air, land, water, animals, plants, etc.
  3. 4. something, such as a disease or a chemical, that may harm people, animals, or the environment
  4. 5. the fact of soil, stone, etc. being gradually damaged and removed by the waves, rain, or wind
  5. 6. the protection of plants and animals, natural areas, and interesting and important structures and buildings, especially from the damaging effects of human activity
  6. 7. An extremely large wave caused by the movement of the earth under the sea, often caused by an earthquake
  7. 8. the act of sending out gas, heat, light, etc
  8. 9. the mixture of gases around the earth
  9. 11. a severe snow storm with strong winds
  10. 12. a fire that is burning strongly and out of control on an area of grass or bushes in the countryside
  11. 14. the hobby of studying wild birds in their natural environment
  12. 19. a person who is interested in or studies the environment and who tries to protect it from being damaged by human activities
  13. 20. A long period in which there is little or no rain. This year a severe drought has ruined the crops
  14. 23. a layer of rock, sand, or earth that contains water or allows water to pass through it