Is there a natural limit to this process, or the will the sea keep getting saltier forever?

Is there a natural process which removes salt from the sea at a significant rate?

How long would it take for the sea to get too salty to support life as we know it?

不，也有自然过程去盐。< / p >

as sea level changes water gets trapped in basins and evaporates leaving the salt behind, this is where many of the salt formation on earth came from. whenever sea levels fall the salinity of the ocean drops. Tectonically isolated basin can remove salt in the same way. The process can even happen repeatedly in the same basin as sea level changes.

There are biological processes that remove it as well the formation of shells and limestone remove some of the ocean salts.

Can it increase yes, but it can also decrease, over earths history there have been saltier and less salty periods.

@John已经回答了第二个问题:“是否存在一种自然过程，使盐以显著的速度从海洋中去除?”这是对第一个问题的回答:“这个过程有一个自然的限制吗?还是海水会永远变得更咸?”

是的，有一个限制，海水不可能永远变得更咸。海水是水和盐的溶液，也就是说，盐溶解在水中。但是溶解度，即一种物质在另一种物质中溶解的能力，有一个叫做饱和的极限。一旦达到这个极限，物质就不能再溶解而析出。< / p >

Saturation of salt in water is 357 g L$^{-1}$ (at 20 °C, it depends on temperature), about 10 times the current salinity of seawater. If you keep adding more salt to such water, it will not longer be able to dissolve but will instead precipitate at the bottom of the sea.