Salty water, or a salty solution
The total amount of dissolved salts in ocean water is referred to as "Salinity". :)
Tufa towers at Mono Lake are visible today because the lake's water levels have significantly decreased since their formation, exposing these structures that were originally formed underwater due to the interaction of freshwater springs and alkaline lake water. This means that Mono Lake has a high salinity and alkalinity, which contribute to the precipitation of calcium carbonate and the growth of tufa formations. The decrease in water levels reveals these towers, indicating changes in the lake's hydrology and salinity over time.