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volcanic bomb




volcanic bombs
Basaltic lava bombs erupted by Mauna Kea Volcano, Hawai'i.
Credit: J. P. Lockwood / U.S. Geological Survey

A lava fragment that is ejected while viscous (partially molten) and larger than 64 mm (2.6 in) in diameter. Many volcanic bombs acquire rounded aerodynamic shapes during their travel through the air. Volcanic bombs include breadcrust bombs, ribbon bombs, spindle bombs (with twisted ends), spheroidal bombs, and "cow-dung" bombs.


Related category

   • GEOLOGY AND PLANETARY SCIENCE

Source: U.S. Geological Survey