Sea salt is salt that is produced by the evaporation of seawater. It is used as a seasoning in foods, cooking, and cosmetics. It is also called bay salt, solar salt, or salt. Like mined rock salt, production of sea salt has been dated to prehistoric times. There is no scientific evidence that consuming sea salt instead of more refined sodium chloride salts has any health benefit.

Answer this question: manufacture of salt from seawater is which change? Let's give stream of consciousness first:
To answer the above question, the relevant sentence is: Sea salt is salt that is produced by the evaporation of seawater.
So, the final answer is evaporation.