volcanic bomb

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English[edit]

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Noun[edit]

volcanic bomb (plural volcanic bombs)

  1. (volcanology) A tephra, larger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption.
    Synonym: lava bomb
    • 1844, Charles Darwin, Geological Observations on the Volcanic Islands, visited during the Voyage of H.M.S. Beagle:
      Fragment of a spherical volcanic bomb, with the interior parts coarsely cellular, coated by a concentric layer of compact lava, and this again by a crust of finely cellular rock

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