In very ancient times, millions of years ago, the Earth was waterless. When the temperature of the Earth began to decrease

In very ancient times, millions of years ago, the Earth was waterless. When the temperature of the Earth began to decrease, the water vapor formed in the atmosphere began to cool and rain poured onto the Earth. Water flooded all depressions, and the seas and oceans were formed. Imagine what water was at that time. in the seas and oceans. What changes have occurred with sea water in time and in connection with what?

At that time it did not contain organic matter and the salts had not yet completely dissolved in it. Also, there were no living organisms such as algae and fish in the water.