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Encyclopedia > Pyroclastic

Pyroclastic rocks are formed from lavas which are ejected into the air, as occur in pyroclastic flows or Plinian eruptions. They include pumice, volcanic bombs, ignimbrite and ash. The airborne fragments themselves are called pyroclasts (often abbreviated to clasts) or tephra. If they conglomerate into solid rock when they land and cool, then they become a pyroclastic rock called tuff. If they do not then they are still called tephra.

The word is derived from Greek pyro, meaning fire, and klastos, meaning broken; the rocks being "broken by fire".

See also

  Results from FactBites:
Pyroclastics - Wikipedia, the free encyclopedia (152 words)
Pyroclastics (literally "Fire Rock") are debris thrown from volcanoes during an eruption.
A Pyroclastics eruption entails spitting or "fountaining" lava, where the lava will be thrown into the air along with ash, Pyroclastics materials, and other volcanic byproducts.
Ash is also considered to be a "Pyroclastics" because it is a fine dust made up of volcanic rock.
vhdefined (558 words)
Pyroclastic flows are extremely dangerous to anything living in its path and devastate the area that it flows over.
Pyroclastics are the blocks, bombs, lapilli, and ash that are erupted from a volcano and spread along the ground.
It is pretty obvious that the size of the pyroclast determines the distance that it is thrown from its source; however, wind plays a key role in the dispersion of the finer lapilli and ash.
  More results at FactBites »



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