Science crossword puzzle

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Across
  1. 3. regions along coastlines where streams or rivers flow into a body of water
  2. 4. the process of one ecological community gradually changing into another
  3. 7. an underwater structure made from outside skeletons of tiny soft bodied animals called coral
  4. 8. amount of salt dissolved in water
  5. 9. the ocean shore between the Lowest low tide and highest high tide
Down
  1. 1. a stable community that no longer goes through major ecological changes
  2. 2. the process of a body of water being nutrient rich
  3. 5. aquatic ecosystems that have a thin layer of water covering soil that is mostly wet
  4. 6. the first species that colonize new or disturbed land