vocabulary exercise

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Across
  1. 1. illegal hunting
  2. 3. a period of dryness
  3. 4. the practice of, e.g., producing crops
  4. 7. symbiosis is a mutual _ of two species
  5. 9. the destruction of forests
  6. 10. any kind of weather condition where something's falling from the sky
  7. 13. the community of interacting organisms and their physical environment
  8. 14. an animal under the threat of becoming extinct is _
  9. 15. Volkswagen exhaust _ scandal began in 2015
Down
  1. 2. a tragic event
  2. 5. biological variety in an environment
  3. 6. the process of becoming desert
  4. 8. Tens of thousands of elephants are being killed every year for their _ tusks
  5. 11. more frequent wildfires are an effect of _ change
  6. 12. carnivores are at the top of the _
  7. 14. A glacier's gradual movement causes _