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Lava dome
Lava domes are rounded, steep-sided mounds built by
magma that is highly
resistant to flow, usually either
dacite or
rhyolite. Such magmas
are typically too viscous to move far from the
vent before cooling
and crystallizing. Domes may consist of one or more individual
lava flows.
Left: An aerial view of the 600-foot lava dome in the crater
of Washington's Mt. St. Helens, as seen between the May and July
eruptions in 1980.
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