Citations for Marine Biome travel blog

Websites used:

http://en.wikipedia.org/wiki/Pelagic_zone
http://marinebio.org/oceans/open-ocean.asp
http://evolution.berkeley.edu/evolibrary/news/121001_acidicoceans
http://www.protectplanetocean.org/collections/introduction/introbox/humanimpact/introduction-item.html