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Which of these rocks can float on water?
Answer – Pumice – Pumice is a volcanic rock formed when lava cools very quickly in water. This results in a rock that is low-density and full of bubbles. Pumice can float on water and occasionally after a large volcanic eruption, it can form large rafts of rock on the ocean which can cause a danger to shipping. The pumice eventually becomes waterlogged and sinks making these floating pumice islands a temporary phenomena. The bubbles in pumice mean that when the rock is broken into pieces it is very sharp and for this reason, it is often used as an abrasive, for example, to produce sandpaper.:
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