killing germs.
The aquarium filters, airstones running, jumping fish and other normal water movement cause salty water to be sprayed onto the lid. The water evaporates, leaving the salt behind.
I would assume some kind of polution and syphon off the bottom of the tank and do a massive water change.
The salt makes the water more dense.
Salt is hygroscopic, absorb water.
An aquarium is usually filled to the top with water as it houses fish. A reptile tank is never filled with water because it houses reptiles.
You place the salt / sand mixture in warm water. The salt will dissolve in the water and you than then four the salt solution off the sand, leaning just sand. Then boil the salt solution untill all the water evaporates, leaving the salt.
It's not the color that is significant, its the fresh water that the ice cubes were made with. Salt water is heavier than fresh water so the fresh water floats a top the salt water.
The water becomes murky and the salt rises to the top
no< fresh water will become mixed with the salt water
The body of water you will never sink in is The Dead Sea, because it has allot of salt and the salt will push you to the top of the water THEREFORE you WILL NOT sink.
oil doesn't settle in salt water nor fresh water, it floats to the top
Because the salt in the water builds up at the top. But in regular water, it has nothing in it to build up...