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This is due to an amazing property of water. Unlike most other substances, water actually expands when frozen. You can prove this to yourself by filling a glass with ice water all the way to the top. As the ice melts, the glass won't overflow. This same property is what makes ice skating possible, too. As the blade presses on the ice, the pressure actually causes the ice to melt, allowing the skate slide on a thin layer of liquid.

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