seawater has 300 x salt concentration of river water) --reflects sedimentation (precipitation) processes --other inputs/exchanges, such as basalt-seawater reactions at midocean ridges All other dissolved substances in seawater are at very low concentrations (part per million or billion) (ppm or ppb;
(seawater; has; 300 x salt concentration of river water) (other inputs/exchanges, such as basalt-seawater reactions at midocean ridges All other dissolved substances in seawater; are; at very low concentrations)
seawater other inputs/exchanges, such as basalt-seawater reactions at midocean ridges All other dissolved substances in seawater
has are
300 x salt concentration of river water
at very low concentrations