NEED SOME EXTRA SALT?

Wouldn't it be refreshing to spend a day at the beach and not leave with that salty coating after a swim in the Atlantic. I guess we could trade JAX Beach for the Great Lakes and not worry about hosing off after a swim. But how did all that salt get into the ocean anyways? Well, salt is dissolved in lakes and rivers. It is in the rain and the tap we drink from. But the concentrations are lower than seawater which is held at a constant around 35 parts per thousand or 3.5% the weight of seawater. So, looking at the math, a cubic mile of seawater weights almost as much as 1,500 USS John F. Kennedy aircraft carriers.

Seawater typically has a salinity between 3.1% and 3.8% but rain, glacier melt, upwelling, and evaporation can vary the salt content throughout the world. The Red Sea is the most salty open body of water but Lakes can be salty. Evaporation is greater than freshwater influx in the Great Salt Lake in Utah.

A closed cycle stops the oceans from getting too salty. Rivers bring salt into the oceans by dissolving minerals. Underwater volcanoes and deep sea hydrothermal vents spout out Sodium Chloride NaCL.
But salt is absorbed by many marine organisms and it is leached out of the water into the seafloor. Together these processes regulate salinity.