Europe: Human-Environment Interaction

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Across
  1. 3. These grow rapidly, die, decay, use up oxygen and kill fish
  2. 6. A man-made freshwater lake in the Netherlands
  3. 9. Venice is made up of 120 of these
  4. 10. Needed to support buildings; forests are gone because of it
  5. 11. Country that lies below sea level
  6. 13. These are used by the Dutch to pump water off the land
  7. 14. Sulfur dioxide and nitrogen oxide emissions produce this; it kills trees
  8. 16. This has allowed seawater in and caused floooding
Down
  1. 1. An arm of the North Sea the Dutch blocked off
  2. 2. Clearing forests from an area
  3. 4. Italian city that uses canals, not roads to get around
  4. 5. High earthen platforms that offer safety during floods
  5. 7. Land reclaimed from the sea and is now useful to people
  6. 8. Structures used to control the sea
  7. 12. Sewage combines with this to threaten Venice
  8. 15. Banks made of earth to hold back the sea