This is why some liquids mix and some don't. As you know, some liquids do mix. It all depends on the density. Oil is denser than water, so it floats on top of the water. They are immiscable. That's like when you're playing on the playground at school. There is a group of girls over there and a group of boys over here. They just want to be with their friends. It's the same with the oil. It doesn't want to mix with the water. That is what immiscable means. But there is a way to make them mix. If you put salt on top of the oil, it will get pushed down to the bottom of the water. But when the salt dissolves, the oil goes back with it's friends. It looks sort of like a lava lamp. That is why some liquids mix and some don't.

I need to: use paragraphs