Human Impact on the Ocean

4. chemical used to kill insects
7. changes in the environment caused by heated water
12. the increase of pollutants as you go up the food chain
14. species that face extinction but are not in immediate danger
15. chemicals that break up oil spills so they can spread out in the water
16. species with low numbers that face extinction
17. species that are in immediate danger of disappearing
18. a metal with a relatively high density
19. substance from land that can carry fertilizers and harmful substances into the ocean

1. susbtances that remain in the environment for years
2. warm highly salty water that is a by-product of desalination plants
3. a property exhibited by certain atoms that spontaneously emit particles
5. the introduction by humans of harmful substances into the environment
6. the solid wastes that are taken out of sewage
8. human-induced extinction
9. organisms that are no longer in existence
10. the global system of evaporation and condensation of substances
11. very small pieces of plastic that are commonly found in toothpastes and skin scrubs
13. capable of being broken down by bacteria