What goes around comes around
By Bri Hibner
What Are Toxic Materials?
Mercury can get into water sources through air pollution, manufacturing, and natural sources. Mercury is passed up the food chain and eventually makes its way up to humans causing birth defects and nervous system damage.
Dioxin is very toxic to marine life and causes genetic Chromosomal aberrations in marine animals. It could also cause cancer in humans. This toxic material comes from bleaching papers and making some herbicides
PCBs are passed through the food chain and entered marine life by pre 1970's electrical equipment. PBCs cause developmental problems in children and reproductive problems in other animals.
Polynuclear Aromatic Hydrocarbons or PAHs are caused by oil spills, road run off, and the burning of wood and coal. These can Cause Marine life genetic and chromosomal problems.
Radioactivity is harder to study because it is a newer problem after the discovery of nuclear chemistry and the demand for nuclear reactors for energy. Scientist still today don't know much of the effect it has on marine life or humans. They know that it goes into the water from background radioactivity, nuclear waste, reactor leaks, and fall out.
Toxic materials are bad for everybody in a food web and cause some serious problems across the board
Amounts of Toxic material
Lots of acts have been passed since 1890 protecting oceans. In 1890 River and Harbors act was passed and it prohibited any discard of dredged material in inland and coastal waters. In 1972 lots of acts were pass that prohibited the disposal of waste in oceans. In 1973 an act was passed that ships can't dump oil into the ocean. Finally in 2000 any dumping of really anything into a body of water was prohibited. Also the dumping of radioactive materials is directly prohibited.
All of these acts have helped with the oceans toxic pollution levels go down over the years. Toxic materials are hard to get rid of and may never go away. This is why people must think into the future before they do something now.
"Cleanups." Ocean Planet:perils-toxic Materials. N.p., n.d. Web. 11 Nov. 2014.
"SeaWeb - Ocean Briefing Book." SeaWeb - Ocean Briefing Book. N.p., n.d. Web. 11 Nov. 2014.
"Water Encyclopedia." Pollution of the Ocean by Sewage, Nutrients, and Chemicals. N.p., n.d. Web. 10 Nov. 2014.