sea beds have salt producing mines.
It is more salty than the average sea.
The Baltic Sea is known as Brackish, that is a little more salty than fresh water, but not as salty as sea water
Yes, it is a sea and has salty water.
a sea
no
The Mediterranean Sea is less salty than the Dead Sea. The Dead Sea is the saltiest water on earth because of the high level of evaporation.
It is the definition of fresh water. Fresh water comes from rain and is pure water, until it reaches the sea which is full of salt.
The Baltic Sea is known as Brackish, that is, a little more salty than fresh water, but not as salty as sea water
That is a statement, not a question, and it is true.
Because the fresh water turns into salty water.
Rain water would normally boil at a slightly lower temperature than sea water, assuming the rain water has fewer dissolved particles in it compared to sea water.
The short answer is it's the salt. But I think what you're really asking is how did it get so salty. As fresh water flows through the continents, it picks up salt from the minerals. Then that is dumped into the ocean basin when the water gets to the sea. The water evaporates and returns as rain water, but the minerals stay behind. So after a long time, you get an accumulation of salt in the ocean.