This is because the most of the water is available in the form of seas and ocean which is salty in nature.
three form of water are-
Water can be found in solid form on Earth in the form of ice caps, glaciers, snow, etc. There is a tiny amount of water in the form of sol.
Liquid water makes up a sizable fraction of the overall amount of water on planet. The main sources of liquid water include the oceans, seas, lakes, rivers, rain, and groundwater. Sea and ocean water is quite salty by nature.
Very little water is found in the form of vapour. The main sources of water in the vapour form include clouds, soil moisture, and atmospheric vapour. Most of the time, water is found as vapour in the troposphere.
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