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
   Fragmented rock material ejected by a volcanic explosion. Also called pyroclastic material.
   Found on http://www.physicalgeography.net/physgeo
   
   
5. 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
   
   
6. 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
   
   
7. Tephra
   Tephra horizons in south-central Iceland. The thick and light coloured layer at center of the photo is rhyolitic tephra from Hekla. `Tephra` is fragmental material produced by a volcanic eruption regardless of composition, fragment size or emplacement mechanism. Volcanologists also refer to airborne...
   Found on http://en.wikipedia.org/wiki/Tephra