Because it does
I think boil it distillation and reverse osmosis are the 2 most common ways.
Type your answer here... heats up water and it will kill fish and over merine animals.
Put it in the sea.
No, a volcano cannot turn water into acid. However, a volcano can cause the PH of water near said volcano to lower significantly. In other words, a volcano can cause water to be more acidic. This is...
the density of sea increases with depth