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How waters properties shape planets

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As we all know water changes the face of our planet in dramatic ways. Rivers can blast paths through the ground with remarkable speed making their way to massive oceans. But one of waters unique properties is even more useful in changing the shape of the earth. Unlike almost every other material water expands when it changes from a liquid to a solid. This is what causes icebergs to float. It also prevents most of the earth's surface from being covered in big rocks like other planets. This is because when liquid water seeps into the cracks in a rock and freezes it expands cracking the rock and eventually creating soil. Other planets with different liquids do not have this property and therefore have surfaces that are covered with boulders.

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