EDITOR: This is a great little video on the Great lakes sent to me from one of our readers of the website. Thanks to Dirk!
Once you have entered the site, go up to the far left side where it says "Water is?" and hold your mouse there, all of the various areas will come up for you to view once you click on it. When done with one area, move to the next.

http://waterlife.nfb.ca/