Processes that increase the density of seawater include evaporation and

The answer might be deposition if your counting the particles of sediment in the water. Hope this helps

In sea,, water is salty thats mean salt are solute with water which increase its density

But evaporation of water only water evaporated and salt remain in sea water

So,
Water evaporate and loss own initial volume but salt remains same,,, conitnuesly evaporation and salt make more and more water dense

Evaporation is the best example ac ording to your question

Also mieral of rock solute with water calcium magnesium makes it more and more dense to sea water

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