The surface mixed zone is characterized by ________.
◦ low density water near the surface that rapidly increases in density with depth
◦ a rapid change from warm temperatures on top to cold temperatures at a depth of about 300 meters
◦ nearly constant temperatures to a depth of about 300 meters
◦ a mixture of temperatures and densities to a depth of about 300 to 450 meters depth
◦ high density water near the surface that rapidly decreases in density with depth