Tephra
noun, (used with a plural verb)
1.
clastic volcanic material, as scoria, dust, etc., ejected during an eruption.
noun
1.
(mainly US) solid matter ejected during a volcanic eruption
tephra
(těf’rə)
Solid matter, such as ash, dust, and cinders, that is ejected into the air by an erupting volcano. Tephra is a general term for all pyroclastic materials ejected from a volcano.
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