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On the front, a photo of pumice and "It was magma before it was cool".
On the back, "Pumice is a rough textured volcanic glass that is created when an undersea volcano ejects super-heated, highly pressurized lava. After it is ejected, the lava unergoes rapid depressurization, creating gas bubbles in the lava (similar to bubbles in a carbonated drink), and simultaneous rapid cooling, freezing the bubbles in the rock."
