Look up: tephra

1. tephra
   Any rock material produced by a volcano.
   Found on http://cdiac.ornl.gov/glossary.html
   
   
2. tephra
   ash, pyroclastic material and fiery bombs ejected by volcanic explosion Category: Management in the public and private sector
   Found on http://www.mijnwoordenboek.nl/definition
   
   
3. tephra
   (from the article `pyroclastic flow`) The term tephra as originally defined was a synonym for pyroclastic materials, but it is now used in the more-restricted sense of pyroclastic ...
   Found on http://www.britannica.com/eb/a-z/t/26
   
   
4. Tephra
   Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size or emplacement mechanism. Volcanologists also refer to airborne fragments as pyroclasts. Once clasts have fallen to the ground they remain as tephra unless hot enough to fuse together into pyrocla...
   Found on http://en.wikipedia.org/wiki/Tephra
   
   
5. Tephra
   Fragmented rock material ejected by a volcanic explosion. Also called pyroclastic material.
   Found on http://www.physicalgeography.net/physgeo
   
   
6. tephra
   Tephra erupted by Mount St. Helens on 18 May 1980 ranging in size from ash (left 2 piles) to lapilli (right 2 piles). Credit: D. Wieprecht / U.S. Geological Survey Volcanic ash falls to ground and creates darkness, Mount Pinatubo in the Philippines. Credit: E. Wolfe / U.S. Geological Survey ...
   Found on http://www.daviddarling.info/encyclopedi
   
   
7. Tephra
   Materials of all types and sizes that are erupted from a crater or volcanic vent and deposited from the air.
   Found on http://midju.tripod.com/glossary.html
   
   
8. Tephra
   Materials of all types and sizes that are erupted from a crater or volcanic vent and deposited from the air.
   Found on http://volcano.oregonstate.edu/education