what % of water on earth is fresh compared to salt
Sea water covers 97% of the earth surface, while fresh water just 3% - an imbalance which makes drinkable water a precious resource. Sea water contains a great amount of salt up to 3.5 %, while fresh water has only a concentration of 0.5% salt. The increased salt level determines a higher density for sea water and a decreased freezing point, while fresh water has a lower density and a normal freezing point.