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Volcanic rock that has been fragmented by explosions during an eruption or by the collapse and disintegration of the flanks of domes or lava flows.

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15y ago

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How do you spell pryoclastic?

The superheated mixture of particles and gas from volcanoes is "pyroclastic".


Which type of the volcano gives pyroclastic debris?

Pyroclastic debris is usually produced by stratovolcanoes. However, shield volcanoes occasionally produce pryoclastic material in phreatomagmatic eruptions, which involve water interacting with magma.


Why were the citizens of Pompeii unconcerned about Mount Vesuvius?

Until it erupted they didn't know it was a volcano. The total event started with an earthquake about 3 days before the final eruption and they were use to earthquakes. When it did finally erupt they didn't have a chance. The pryoclastic cloud took less than 5 minutes to cover the entire area and it buried 2 cities as well as changed the coastline.


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Is there a pahoehoe in a volcanic explosive eruption?

Not usually. Pahoehoe refers specifically to a lava flows. These can occur in mildly explosive eruptions, but usually explosive eruptions to not produce lava flows. Instreat they produce clouds of ash with some lapilli and pumice. Pryoclastic flows often result. These are fast-moving avalanches of superheated ash, gas and pumice. These form a kind of volcanic rock called tuff.


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