Changes in the Ecosystems

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Across
  1. 1. the weight of living organisms
  2. 4. the action of causing so much damage
  3. 6. the variety of life in the world
  4. 10. being populated with large numbers
  5. 12. the remains of a prehistoric organism
  6. 13. energy sources,including oil,and coal
  7. 16. a change in global climate patterns
  8. 17. a period of ten years
  9. 18. the action of introducing something
Down
  1. 2. a solid inorganic substance
  2. 3. the science of farming
  3. 5. the animals species has died out
  4. 7. tending to spread prolifically or harmful
  5. 8. the action of treating someone unfairly
  6. 9. the action of clearing a area of trees
  7. 11. the presence into the environment
  8. 14. a group of organisms
  9. 15. a community of interacting organisms