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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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369:"Hawaii volcano: At least 23 injured as 'lava bomb' hits tourist boat"
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plays a major role in pulling the ejecta into spheres.
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27:Mass of molten rock ejected during an eruption
320:Spindle, fusiform, or almond/rotational bombs
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120:Learn how and when to remove this message
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288:National Museum of Nature and Science
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218:is a mass of partially molten rock (
182:"Bread-crust" type volcanic bomb at
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152:"Fusiform" type volcanic bomb.
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286:Various volcanic bombs in the
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427:USGS Volcano Hazards Program
136:Lava bomb, ejected from the
303:Ribbon or cylindrical bombs
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268:2018 lower Puna eruption
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340:Cored bombs
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247:Mount Asama
188:Puy-de-Dôme
436:Categories
355:References
278:Bomb types
154:Capelinhos
80:newspapers
373:USA Today
348:xenoliths
346:(such as
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216:lava bomb
156:Volcano,
140:Volcano,
110:July 2018
18:Lava bomb
256:Colombia
224:diameter
190:, France
184:Vulcania
378:17 July
294:, Japan
260:Kilauea
252:Galeras
243:igneous
232:viscous
230:ejects
228:volcano
144:in 1983
138:Kīlauea
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162:Azores
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292:Tokyo
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380:2018
236:lava
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