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bread-crust bomb
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bread-crust bomb

volcanic ejecta
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Quick Summary

A "bread-crust bomb" is a type of volcanic bomb characterized by a cracked surface. These bombs are ejected during volcanic eruptions as incandescent, soft lava fragments that cool and harden in flight. The distinctive cracked appearance, resembling the crust of bread, forms when the outer surface solidifies while the interior remains plastic, allowing gas expansion and impact to create fissures. Volcanic bombs are larger fragments of volcanic ejecta, with diameters exceeding 64 mm (2.5 inches), and their final shape is influenced by their initial size, viscosity, and flight velocity.12

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3 Britannica Sources
  1. bread-crust bomb
  2. volcano - Explosions
  3. bomb

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