These terms are the condition for which that code number is to be used. The terms may be synonyms of the code title, or, in the case of other specified codes, the terms are a list of the various conditions assigned to that code.
Physical oceanography, or marine physics, studies the ocean's physical attributes including temperature-salinity structure, mixing, surface waves, internal waves, surface tides, internal tides, and currents.
Oceanography is important to study because the worlds oceans are critically important for sustaining life on Earth. Maintaining ecological balance in the words ocean helps insure we are keeping the worlds carbon levels in check. A large percentage of the worlds oxygen comes from the oceans.