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Caption: Pumice stone is light and brittle with a spongy texture. It is often used to soften the skin of the feet and hands. This igneous rock is riddled with tiny air pockets because the lava that formed it was full of gases. Pumice is so light that it can do what no other rock can: float on water!
Credit: Album / Universal Images Group
Image size: 2589 × 1977 px | 14.6 MB
Print size: 21.9 × 16.7 cm | 1019.3 × 778.3 in (300 dpi)