Science

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Across
  1. 2. the action of preserving something
  2. 3. the process by which fertile land becomes desert typically as a result of drought deforestation or inappropriate agriculture
  3. 7. rainfall made sufficiently acidic by atomsphere pollution that it causes environmental harm typically to forest and lakes
  4. 9. substance that is toxic to plants used to destroy unwanted vegetation
  5. 10. involves the managment and modification of natural environment or wilderness into built environment such as settlements and semi-natural habitats such as areable fields, pastures, anbd managed woods.
  6. 14. the abilty to be maintained at a certain rate or level
  7. 15. all the waters on the earths surface such as lakes and seas and sometimes including water over the earths surface such as clouds
  8. 16. physical rather than biological not derived from living organism
  9. 17. the dependence of two or more people or things on each other
  10. 19. a large naturally occurring community of flora and fauna occupying a major habit
  11. 20. the presence in or introduction into the environment of a substance or thing that has harmful or poisonous effects
  12. 21. a biological community of interacting organisms and their physical environment
  13. 23. is the match of a spices to a specific environmental condition
  14. 24. in biogeography a native species is indigenous to a given region or ecosystem if its presence in that region is the result of only natural processes with no human intevention
Down
  1. 1. is the number of different habitats that one particular region can provide
  2. 4. is waste that has substantial or potential threats to public health or the environment
  3. 5. physical material at the surface of the earth
  4. 6. a substance used for killing insects
  5. 8. the weather conditions prevailing in an area in general or over a long period
  6. 11. os an area of land that drains all the streasms and rainfall to a common outlet such as trhe outflow of a reservoir mouth if a bay or any point along a stream channel
  7. 12. relating or resulting from living things especially in their ecological relations
  8. 13. the variety of life in the world or in a particular habitat or ecosystem
  9. 18. is a tool that allows the user to determine the identity of items in the natural world
  10. 22. a substance used for destorying insects or other organisms harmful to cultivated plants or to animals