There's a lot more to the oceans than salt and water. Many other ingredients make up the rich broth that sustains marine life and helps regulate the Earth's climate. But where do those ingredients come from? To answer that question, French geochemist Catherine Jeandel has collected seawater from all over the world and is examining it for elemental clues. This podcast was produced by Sam Eaton for NOVA and PRI's "The World." For more global environmental stories, visit: http://www.pbs.org/wgbh/nova/earth/ http://www.theworld.org/category/topics/environment/ NOVA is produced by WGBH in Boston. Funding for NOVA is provided by David H. Koch, the Howard Hughes Medical Institute, the Corporation for Public Broadcasting, and PBS viewers.