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are formed by the same processes as spherical bombs, though the major difference being the partial nature of the spherical shape. Spinning during flight leaves these bombs looking elongated or almond shaped; the spinning theory behind these bombs' development has also given them the name 'fusiform
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form from highly to moderately fluid magma, ejected as irregular strings and blobs. The strings break up into small segments which fall to the ground intact and look like ribbons. Hence, the name "ribbon bombs". These bombs are circular or flattened in cross section, are fluted along their length,
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in Japan expelled bombs measuring 5–6 m (16-20 ft) in diameter up to 600 m (2,000 ft) from the vent. Volcanic bombs are a significant volcanic hazard, and can cause severe injuries and death to people in an eruption zone. One such incident occurred at
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Volcanic bombs are known to occasionally explode from internal gas pressure as they cool, but in most cases, most of the damage they cause is from impact, or subsequent fire damage. Bomb explosions are most often observed in "bread-crust" type bombs.
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are formed when highly fluid magma falls from moderate height, so the bombs do not solidify before impact (they are still liquid when they strike the ground). They consequently flatten or splash and form irregular roundish discs, which resemble cow
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bombs'. Spindle bombs are characterised by longitudinal fluting, one side slightly smoother and broader than the other. This smooth side represents the underside of the bomb as it fell through the air.
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in 1993; six people near the summit were killed and several seriously injured by lava bombs when the volcano erupted unexpectedly. On July 16, 2018, 23 people were injured on a tour boat near the
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rocks. Volcanic bombs can be thrown many kilometres from an erupting vent, and often acquire aerodynamic shapes during their flight. Bombs can be extremely large; the 1935 eruption of
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are bombs that have rinds of lava enclosing a core of previously consolidated lava. The core consists of accessory fragments of an earlier eruption, accidental fragments of
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are formed if the outside of the lava bombs solidifies during their flight. They may develop cracked outer surfaces as the interiors continue to expand.
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Bombs are named according to their shape, which is determined by the fluidity of the magma from which they are formed.
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during an eruption. Because volcanic bombs cool after they leave the volcano, they are
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also form from high to moderately fluid magma. In the case of spherical bombs,
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358:"Hawaii volcano: At least 23 injured as 'lava bomb' hits tourist boat"
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160:"Almond" type volcanic bomb found in the Cinder Cones region of the
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plays a major role in pulling the ejecta into spheres.
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211:) larger than 64 mm (2.5 inches) in
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277:National Museum of Nature and Science
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329:Cored bombs
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236:Mount Asama
177:Puy-de-Dôme
425:Categories
344:References
267:Bomb types
143:Capelinhos
69:newspapers
362:USA Today
337:xenoliths
335:(such as
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205:lava bomb
145:Volcano,
129:Volcano,
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245:Colombia
213:diameter
179:, France
173:Vulcania
367:17 July
283:, Japan
249:Kilauea
241:Galeras
232:igneous
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133:in 1983
127:Kīlauea
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