Photoglossary

Block

A volcanic block is a solid rock fragment greater than 64 mm in diameter that was ejected from a volcano during an explosive eruption. Blocks commonly consist of solidified pieces of old lava flows that were part of a volcano's cone.

Block ejected by explosion caused by collapse of active lava delta at Kilauea Volcano. Photo: C. Heliker, 26.1.1988, Hawaii

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