Pip's puzzle

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Across
  1. 3. Inactive for long periods of time
  2. 4. No more living members of a species
  3. 5. Very dry with extreme daytime temperatures
  4. 7. Hurricanes that bring in heavy flooding and rain
  5. 9. Flat land found in the arctic and subarctic regions
  6. 10. A closely related group of islands
  7. 12. Ring shaped reef, Islands, or chain of islands
  8. 13. Continuous extent of land
Down
  1. 1. The way people live and act
  2. 2. Permanently frozen ground
  3. 6. Rock like structures built by layers of coral organisms
  4. 8. A man-made artificial water route
  5. 11. A piece of land surrounded by water.
  6. 14. Complete control of the market
  7. 15. Fine particles of soil