Marine pests and threats

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Across
  1. 1. The introduction of harmful products to an environment
  2. 3. Relating to the sea
  3. 6. Any of a group of synthetic or natural organic materials that may be shaped when soft and then hardened
  4. 8. An animal that is caught and killed by another for food
  5. 9. A long-term change in the earth's climate, especially a change due to an increase in the average atmospheric temperature
  6. 10. Something that can cause potential harm
  7. 13. A transparent, odorless, tasteless liquid, a compound of hydrogen and oxygen
  8. 15. To spread or swarm over in a troublesome manner
  9. 16. The animals of a given region or period considered as a whole
Down
  1. 2. Any part of or the entirety of salt water that covers more than 70 percent of the earth's surface
  2. 4. Of, in or pertaining to water
  3. 5. Of, relating to, bordering on, or located near a coast
  4. 7. The plants of a particular region or period, listed by species and considered as a whole
  5. 8. A destructive animal
  6. 11. The natural environment of an organism
  7. 12. The aggregate of surrounding things, conditions, or influences
  8. 14. An animal that naturally preys on others