volcanic bomb

名词 n.
中文释义

英文释义

名词 n.
  1. A tephra, larger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption.
    — 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

词形变化

volcanic bombs plural
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