Aquatic biomes crossword puzzle

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Across
  1. 2. A mix of fresh and saltwater
  2. 3. 4th largest lake in America
  3. 7. 2nd largest river in America
  4. 10. When river water and seawater mix
  5. 12. Layer of the ocean that gets sunlight
  6. 14. Excess water that could potentially be polluted
  7. 18. Cleans dirty water
  8. 19. wet, muddy land caused by flooding from salt water
Down
  1. 1. Where the North Sea and Great Britain meet
  2. 4. Too much of this can cause a decrease of marine life in the ocean
  3. 5. When a lot of water reaches Earth's land
  4. 6. Layer of the ocean that doesn't get sunlight
  5. 7. Organisms that live in the sea
  6. 8. Harmful chemicals that negatively effects our ocean and our health
  7. 9. Brown algae
  8. 11. A type of swamp made up of wetland and dead plants
  9. 13. Deep trench found at the bottom of the Pacific Ocean
  10. 15. When little water reaches Earth's land
  11. 16. Water that is not salty
  12. 17. Sand and saltwater are found here