America's Amazon

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Across
  1. 4. A vast river delta and estuary in southern AL
  2. 6. The variety of life in a particular habitat or ecosystem
  3. 8. An area of land where all water drains to a common outlet
  4. 10. A species at risk of extinction due to factors like habitat loss
  5. 12. A heavy metal that is highly toxic, particularly in its organic form
  6. 13. A heavily polluted location designated by the government for cleanup and remediation
  7. 14. Where freshwater meets saltwater
  8. 15. The natural environment where an organism or species lives
  9. 16. An area of low-lying ground adjacent to a river
Down
  1. 1. The introduction of harmful substances or contaminants into the environment
  2. 2. A persistent and toxic pesticide that accumulates in the environment and poses risks to wildlife and human health
  3. 3. The protection, preservation, and management of natural resources
  4. 5. A community of interacting organisms and their physical environment
  5. 7. The process of particles settling to the bottom of a liquid
  6. 9. A phenomenon in Mobile Bay where marine creatures, deprived of oxygen, gather at the water's edge
  7. 11. A barrier constructed across a river to control water flow