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And for this one, yeah, it does. It expands. Anyone who's such as yourself, they're experienced the pipes of a freeze, the water expands, and it cracks the pipe. So it does. So it starts expanding from about 4 to about 0 degrees Celsius. And it starts expanding at that point. It expands about 9% of its volume at that point. And the reason for that is it cools. The hydrogen bonds, they force water molecules into a hexagonal crystal. And as it forms this hexagonal crystal, it's producing more space. More space means it's less dense. So it expands. And not only is it less dense, that's why I saw it from float. Second one here is, what is the only substance on Earth's surface that exists as a solid, liquid, and a gas?