Two factors used to identify a water mass are

Question

A water temperature and salinity.

B oxygen concentration and water temperature.

C type of phytoplankton and oxygen concentration.

D salinity and type of phytoplankton.

Answer 1

  The factor that makes one water mass different from another water mass is sound speed. For example an ocean front is defined as a weak front if the sound speed on one side of the front is measured to be 50 feet per second different (faster or slower) than on the other side of the front. A moderate front is 50fps to 150fps, and a strong front is greater than150fps.

   Since sound speed in water is effected by 3 factors; pressure, salinity and temperature, the best answer given would be A. Temperature and salinity.