Why is the sea salty?

As the rain erodes the rock, acids in the rainwater break down the rock. This process creates ions and are carried away in runoff to streams and rivers and, ultimately, to the ocean. Many of the dissolved ions are used by organisms in the ocean and are removed from the water. Others are not used up and are left for long periods of time where their concentrations increase over time.

Two of the most prevalent ions in seawater are chloride and sodium. Together, they make up over 90 percent of all dissolved ions in the ocean. Sodium and Chloride are 'salty.'

Minerals

Dissolved salt rock.

The oceans cover much of the earth including vast salt deposits. As the water dissolves the salt the sun is also evaporating the water intensifying the saltiness.

Various salts (sodium chloride, potassium chloride, and others) are dissolved by rain as it falls on the land, the resulting salty water flows to the oceans.

Because is contains a variety of salts.

Well, the quick answer is that water evaporates but the dissolved salts don't, so dissolved salt content builds up over time. It is more complicated than that in reality, of course, because if salts kept coming in and never left, the oceans would be like the Dead Sea or Great Salt Lake, and the oceans are not like that. Salt water reacts with rock at mid-ocean volcanic zones and the salt content gets buffered over time.

All the tears of misunderstood sharks.

Because it has a lot of salt.

ok

After years and years of river inflow and evaporation, the salt content of the lake water built up to the present levels. The same process made the seas salty. Rivers carry dissolved salts to the ocean. Water evaporates from the oceans to fall again as rain and to feed the rivers, but the salts remain in the ocean.

see

https://www.utdallas.edu/~pujana/oceans/why.html

Because they ran out of sugar.