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Tephra
Tephra is a general term for fragments of volcanic rock and
lava that are blasted
into the air by explosions or carried upward by hot gases in
eruption columns or lava fountains. Tephra includes large, dense
blocks and
bombs, and small, light
rock debris such as
scoria,
pumice,
reticulite, and
ash.
Left: A fountain of hot lava and tephra erupts from a crater
in Hawaii's Kilauea East Rift in 1983.
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