National Geographic
National Geographic: The World Ocean
A collection of four lessons where students look at the vital role oceans play in our lives, at the hydrosphere and the impact humans have on it, how humans use the oceans and who is responsible for protecting them, and the rationale...
CK-12 Foundation
Ck 12: Earth Science: Importance of the Oceans Study Guide
A quick review of the importance of oceans on Earth.