Pinatubo is, like Mount Mayon, a strato volcano. This type of volcano is
steep-sided and composed of alternating layers (layer = strata)
of lava and other volcanic
material, especially volcanic ash.
(flows with mixtures of hot, dry rock fragments and hot gases.
They result from the
explosive eruption of molten or solid rock fragments, or both)
(fragments of volcanic rock and
lava regardless of size, which are blasted into the air by explosions or
carried upward by hot gases)