27.9 MB (2.5 MB compressed)
3828 x 2550 pixels
32.5 x 21.6 cm ⏐ 12.8 x 8.5 in (300dpi)
KEN M. JOHNS / SCIENCE PHOTO LIBRARY KEN M. JOHNS / SCIENCE PHOTO LIBRARY
Geologist Abel Ramirez hefts two pumice boulders. Because of the large number of air pockets, pumice is relatively light. Panum Crater, California.
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