Tephra is a general term for all fragmented material produced and ejected into the air during a volcanic eruption. This includes everything from fine volcanic ash and dust to medium-sized lapilli and large volcanic bombs. Once tephra falls to the ...
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Tephra is a general geographical term for all airborne volcanic ejecta, regardless of size or composition. It includes everything from fine volcanic ash and lapilli (small stones) to large volcanic bombs and blocks thrown into the air during an eruption. ...