From the article: What causes dead zones, and can they be reversed?

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Across
  1. 4. a river in eastern part of the United States where a dead zone has been reversed
  2. 6. this hurricane worsened the hypoxic conditions in the Gulf of Mexico
  3. 8. these two states also have dead zones on their coastlines
  4. 10. a major cause of dead zones, also an essential component of bones
  5. 11. location of the most infamous dead zone in the United States
  6. 12. the Gulf of Mexico dead zone decimated this industry
Down
  1. 1. what a water-based ecosystem does when two many nutrients are added to it
  2. 2. a bay in the western part of the United states where a dead zone has been reversed
  3. 3. a dead zone was first detected here in the 1970s
  4. 5. a primary cause of dead zones, also a component of protein
  5. 7. a dead zone in this location cleared up after the cost of chemical fertilizer increased
  6. 8. spilling this will also worsen hypoxic conditions in water
  7. 9. lacking oxygen