Pyroclastic fragments greater than 64mm (2.5 in) in diameter, that were molten or plastic at the time of ejection. The shape of a bomb is determined by the viscosity of the magma, velocity and length of flight, the rate at which the lava cooled, the rate of expansion of gases, and the type of deformation that occurred upon impact.
a partially molten lava fragment greater than three inches in diameter that is ejected from a volcano during eruption; many bombs acquire rounded aerodynamic shapes as they fly through the air
A large fragment of volcanic ejecta. Some bombs show twisted forms indicating that they were still liquid when ejected, but solidified before landing. 'Breadcrust' and 'cowpat' bombs are named for their appearance.
boulder-size chunk of partly solidified lava explosively ejected from a volcano
Bombs are large, rounded, lava fragments thrown out during an eruption. They are often modified in shape during their flight or upon impact.
Fragment of molten or semi-molten rock, 2 1/2 inches to many feet in diameter, which is blown out during an eruption. Because of their plastic condition, bombs are often modified in shape during their flight or upon impact.
An object thrown from an erupting volcano which is at least partly molten when thrown.
a long pass thrown to a receiver sprinting down the field.
A spherical mass of congealed magma that is blown out during an eruption.
An extremely long pass usually thrown by the quarterback to a receiver running quickly downfield.
rounded block of lava that is ejected from a volcanic crater during eruptions
A volcanic bomb is a chunk of viscous lava (over 64 mm) that is ejected (thrown) from a volcano. Since they are still viscous when ejected, they often have rounded, aerodynamic shapes. Types of bombs include: breadcrust bombs, ribbon bombs, spindle bombs, spheroidal bombs, and "cow-dung" bombs.