US Navy
Office of Naval Research: Ocean Water
This highly informative site delves into salinity, pressure, density, temperature acoustics, and optics associated with ocean water. A quick quiz follows the information presented.
CK-12 Foundation
Ck 12: Physical Science: Oceanic Pressure
[Free Registration/Login may be required to access all resource tools.] Oceanic pressure and how it changes with depth, and how to adjust to this change.
Other
Usc: Climate Controls
An effective presentation of six main climate controls: latitude, land vs. water, geographic position, altitude, currents, pressure and winds.