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tephra

n. (context geology English) The solid material thrown into the air by a volcanic eruption that settles on the surrounding areas.

Wikipedia
Tephra

Tephra is fragmental material produced by a volcanic eruption regardless of composition, fragment size or emplacement mechanism.

200px|thumb|right|Tephra horizons in south-central Iceland. The thick and light coloured layer at the centre of the photo is rhyolitic tephra from Hekla. 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 pyroclastic rock or tuff. 200px|thumb|right|A 2007 eruptive plume at Mount Etna producing volcanic ash, pumice and lava bombs.

Usage examples of "tephra".

Mighty columns of tephra, all the pent-up material that Falcon could fling into the air from its huge maw, seethed and erupted in spasms, hurling ash, magma and boulders high into the sky.

When this condition prevails, column collapse takes place, generating pyroclastic flows and surges, which are far more lethal than tephra fall.

Here and there, lava mixing with groundwater caused irruptions of piles of blocky tephra, which have weathered into fantastically tortured shapes, like sculpture gardens based on Dali paintings.

When this condition prevails, column collapse takes place, generating pyroclastic flows and surges, which are far more lethal than tephra fall.