NASA
Nasa: Space Place: Go With the Flow: An Ocean Currents Game
You are in a submarine and need to fix the currents to take you where you want to go. You want to get the key to the treasure chest full of gold!
University of Southern California
Usc: The Composition of Ocean Water
This site gives background information to ocean water and its contents. It has a link to an detailed chart showing the minerals and their content amount in ocean water. It also has links to activities.