Volcanic Bomb


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Volcanic Bomb

 

a clump of lava, ejected during an eruption in a liquid or plastic state, which takes on one or another form in flight. Volcanic bombs are 1 cm to 7 m long. The most important of the many forms of volcanic bombs are the waferlike forms, characteristic of very liquid lava, clumps of which are flattened as they fall to the earth; twisted, spindlelike, pearlike, globular, and ribbon-shaped forms, characteristic of low-viscosity basaltic lavas, which harden in flight; and round or irregular multifaceted clumps of lava covered with a network of cracks—bread-crust bombs— characteristic of hardened acidic and andesite lavas.

References in periodicals archive ?
Sunday "with lava fountaining with the ejection of volcanic bombs.
Disembarking, we admired volcanic bombs the size of small cars that had embedded themselves in the ground, while the crew prepared themselves for the first takes.