pyroclast - translation to arabic
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pyroclast - translation to arabic

FRAGMENTAL MATERIAL PRODUCED BY A VOLCANIC ERUPTION
Pyroclast; Tefra; Tephra layer; Pyroclasts
  • Rocks from the [[Bishop tuff]], uncompressed with [[pumice]] on left; compressed with [[fiamme]] on right
  • Volcanic tephra at [[Brown Bluff]], Antarctica (2016)

pyroclast         
قذيفة صخرية بركانية جـ قذائف
قذيفة صخرية بركانية جـ قذائف      

pyroclast

Definition

tephra
['t?fr?]
¦ noun Geology rock fragments and particles ejected by a volcanic eruption.
Origin
1940s: from Gk, lit. 'ash, ashes'.

Wikipedia

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 into pyroclastic rock or tuff. Tephrochronology is a geochronological technique that uses discrete layers of tephra—volcanic ash from a single eruption—to create a chronological framework in which paleoenvironmental or archaeological records can be placed. When a volcano explodes, it releases a variety of tephra including ash, cinders, and blocks. These layers settle on the land and, over time, sedimentation occurs incorporating these tephra layers into the geologic record. Often, when a volcano explodes, biological organisms are killed and their remains are buried within the tephra layer. These fossils are later dated by scientists to determine the age of the fossil and its place within the geologic record.