<P> Deep ocean water ( DOW ) is the name for cold , salty water found deep below the surface of Earth 's oceans . Ocean water differs in temperature and salinity . Warm surface water is generally saltier than the cooler deep or polar waters ; in polar regions , the upper layers of ocean water are cold and fresh . Deep ocean water makes up about 90 % of the volume of the oceans . Deep ocean water has a very uniform temperature , around 0 - 3 ° C , and a salinity of about 3.5 % or as oceanographers state as 35 ppt ( parts per thousand ) . </P>
<P> Deep ocean water ( DOW ) is the name for cold , salty water found deep below the surface of Earth 's oceans . Ocean water differs in temperature and salinity . Warm surface water is generally saltier than the cooler deep or polar waters ; in polar regions , the upper layers of ocean water are cold and fresh . Deep ocean water makes up about 90 % of the volume of the oceans . Deep ocean water has a very uniform temperature , around 0 - 3 ° C , and a salinity of about 3.5 % or as oceanographers state as 35 ppt ( parts per thousand ) . </P>
what is the temperature at bottom of ocean
what is the temperature at bottom of ocean
around 0 - 3 ° C
around 0 - 3 ° C