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One of the most common events that causes the rapid cooling of an igneous rock is its collision with a water-based object. This is included but not limited to bodies of water, icebergs, and snow. The rapid cooling causes air bubbles to be trapped within the rapidly hardening rock, thus resulting in a far less dense geological structure. Certain types of igneous rock, such as pumice, have so much air trapped it that it is less dense than water, enabling it to float.

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