Figure 14.8
Lapilli and pumice. (A) These small pebbles, shown in the top photo, are lapilli formed by an eruption on the flank of Darwin Volcano on the Galápagos Islands. The lower photo shows a polished cross section of a lapillus. The rings were formed as the rock traveled through the air and molten debris stuck to it, much like a hailstone grows in a thunderstorm. (B) This man easily lifts a large, ai(A. © David K. Lynch; B. Courtesy of Richard Nolthenius, Cabrillo College)