<P> Until the winter of 1978 -- 79 , when a major mixing event took place , the Dead Sea was composed of two stratified layers of water that differed in temperature , density , age , and salinity . The topmost 35 meters ( 115 ft ) or so of the Dead Sea had an average salinity of 342 parts per thousand ( in 2002 ) , and a temperature that swung between 19 ° C ( 66 ° F ) and 37 ° C ( 99 ° F ) . Underneath a zone of transition , the lowest level of the Dead Sea had waters of a consistent 22 ° C ( 72 ° F ) temperature and complete saturation of sodium chloride ( NaCl ) . Since the water near the bottom is saturated , the salt precipitates out of solution onto the sea floor . </P>
<P> Until the winter of 1978 -- 79 , when a major mixing event took place , the Dead Sea was composed of two stratified layers of water that differed in temperature , density , age , and salinity . The topmost 35 meters ( 115 ft ) or so of the Dead Sea had an average salinity of 342 parts per thousand ( in 2002 ) , and a temperature that swung between 19 ° C ( 66 ° F ) and 37 ° C ( 99 ° F ) . Underneath a zone of transition , the lowest level of the Dead Sea had waters of a consistent 22 ° C ( 72 ° F ) temperature and complete saturation of sodium chloride ( NaCl ) . Since the water near the bottom is saturated , the salt precipitates out of solution onto the sea floor . </P>
whats at the bottom of the dead sea
whats at the bottom of the dead sea
salt
salt