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Illustrated Volcano Glossary

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bomb

Volcanology: volcanic bomb
Large bomb ejected from Etna volcano's SE crater.
Large bomb ejected from Etna volcano's SE crater.
Ejected fragments of fresh magma larger than 64 mm in diameter, often shaped aerodynamically during their flight.
Volcanic bombs are lava fragments larger than 64 mm in diameter that were ejected while still viscous and partially molten. Many 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.

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block - breadcrust bomb - explosive
 

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