Parameter Tree:
EARTH SCIENCE > OCEANS > OCEAN CHEMISTRY > OXYGEN

Definition:
A colorless, odorless, gaseous element, constituting 21 percent of the
volume of the atmsophere, and essential for aerobic forms of life. Gaseous
oxygen has a chemical forumla of O2. Dissolved oxygen is included as a
detailed variable under Oxygen.  


Reference:
Adapted from:
  • Porteous, A. 1996. Dictionary of Environmental Science
    and Technology. John Wiley and Sons. p. 392.
  • Websters College Dictionary.
    1991. Random House.