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Pelean-type eruption
A violent explosive eruption dominated by pyroclastic flows. (See also: Glowing avalanche.) Mount St. Helens erupted in this way in 1980.
Pipe
 Pele’s hair
Pele’s hair
Thin strands of lava that cool as they fly through the air during an eruption of lava. (See also: Tephra.)
Pele’s tears
Small pieces of lava that are thrown clear of lava fountains and cool as they fly through the air
to make teardrop-shaped bombs. (See also: Tephra.)
Phenocryst
An especially large crystal embedded in smaller mineral grains or in igneous rock. Phenocrysts are common in granite.
Phreatic eruption
Steam-driven explosions that occur when water beneath the ground
is heated by magma. Basalt can superheat water to 1,170°C in
this way, producing an explosive outburst of steam, water, ash, blocks, and bombs.
Pillow lava
Pillow-shaped masses of lava that form under water.
 Phreatic eruption—The Mount St. Helens eruption during a Phreatic (Plinian) eruption phase.
Pipe
(See: Vent.)
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