http://articles.mercola.com/sites/articles/archive/2005/10/29/you-might-not-have-known--part-one.aspxAlaska More than half of the coastline of the entire United States is in Alaska . Amazon The Amazon rainforest produces more than 20 percent of the world's oxygen supply. The Amazon River pushes so much water into the Atlantic Ocean that, more than 100enCommunityServer 2008.5 SP1 (Build: 31106.3070)