The eruption was preceded by a two-month series of earthquakes and steam-venting episodes, caused by an injection of magma at shallow depth below the volcano that created a huge bulge and a fracture system on Mount St. Helens' north slope. An earthquake at 8:32:17 a.m. on May 18, 1980 caused the entire weakened north face to slide away, suddenly exposing the partly molten, gas- and steam-rich rock in the volcano to lower pressure. The rock responded by exploding a hot mix of lava and pulverized older rock toward Spirit Lake so quickly that it overtook the avalanching north face.
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Volcano
Lava can't flow violently. Highly explosive eruptions such as the 1980 eruption of Mount St. Helens do not produce lava flows: they produce clouds of ash, gas, and pumice. Mount St. Helens has produced "quiet" lava flows at times.
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Convergent
Mount Saint Helens is located in the United States, specifically in the state of Washington.
Yes. Mount Saint Helens is located in Washington.
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Mount Saint Helens is situated within the Gifford Pinchot National Forest. The olate that Mount Saint Helens is situated is called the subduction zone.
Mount Saint Helens is the valcano. It's pretty close to itself.
No. Mount St. Helens is south-southwest of Mount Ranier.
No. Mount Saint Helens is in Washington state.
Mount St. Helens is a active volcano, in the Washington State.
erupted
No. Mount Helens is on the mainland of North America.