A volcanic bomb is a mass of molten rock (tephra) larger than 64 mm (2.5 inches) in diameter, formed when a volcano ejects viscous fragments of lava during an eruption. They cool into solid fragments before they reach the ground. Because volcanic bombs cool after they leave the volcano, they do not have grains making them extrusive igneous rocks. ...
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http://en.wikipedia.org/wiki/Volcanic_bomb
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 in diameter. Many volcanic bombs acquire rounded aerodynamic shapes during their travel through the ...
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A projectile of hot magma or rock that is blown from the vent during a volcanic eruption. These soli
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http://www.encyclo.co.uk/local/22392
A hard fragment of lava that was liquid or plastic at the time of ejection and acquired its form and surface markings during flight through the air. Volcanic bombs range from a few millimeters to more than a meter in diameter.
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