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Mt St Helen's eruption of 1980 was a pyrocastic flow diverse lava, ranging from olivine basalt to andesite and dacite). The magma is believed to come from another area laterally located to the east. Magma and rock under the volcano are cool.
Wiki User
∙ 7y ago
Wiki User
∙ 9y agoAs with most stratovolcanoes the composition of material erupts varies over time. In its most recent bout of activity it has produced dacite lava, which is compositionally in between andesite and rhyolite.
Wiki User
∙ 14y agoit has andesite and basalt
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Does Mount St Helens spew pahoehoe pillow Aa or Blocky lava?
Mount St Helens produces blocky lava.
What kind mountain is mount st Helens?
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
What type of rock layer does mount st helens have?
As Mount St. Helens is a volcano the slopes would be covered in layers of volcanic dust and lava.
Is mount st Helens high in silica or low in silica?
Mount St Helens produces mostly dacite lava, which is relatively high in silica.
Mount St Helens has layers of this type of rock as well as Andesite through which several domes of Dacite lava have erupted?
The rock type you're looking for is basalt -- St. Helens contains basalt, andesite, and dacite in the form of lava flows and pyroclastic deposits.
Does Mount St Helens spew pahoehoe pillow Aa or Blocky lava?
Mount St Helens produces blocky lava.
Is Mt St Helens a lava dome?
No. Mount St. Helens is a stratovolcano. There is a lava dome in the crater.
What kind mountain is mount st Helens?
Mount St. Helens consists of lava rock interlayered with ash, pumice and deposits, together with layers of basalt and andesite.
Does Mount St Helens lava flow violently or quietly?
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.
What type of rock layer does mount st helens have?
As Mount St. Helens is a volcano the slopes would be covered in layers of volcanic dust and lava.
Is mount st Helens high in silica or low in silica?
Mount St Helens produces mostly dacite lava, which is relatively high in silica.
What is mount st helens made out of?
alternating layers of lava and tephra
Mount St Helens has layers of this type of rock as well as Andesite through which several domes of Dacite lava have erupted?
The rock type you're looking for is basalt -- St. Helens contains basalt, andesite, and dacite in the form of lava flows and pyroclastic deposits.
What rock type is mount st Helens?
the type of material it is, is a composite which has high eruptive forces, has high silica content, and has high gas content. which makes it an eruption product of gas and ash.
What material is mount st helens made of?
by ash, rock, lava, and gas
How did the people die of mount st Helens?
Mount St Helens was an active volcano..... put 2 and 2 together. Lava and Humans dont mix very well!
What type of volcano rock fragment or lava comes out of mt st helens?
Mount St Helens erupts dacitic lava, which forms dacite when it cools. Because of the high gas content and high viscosity much of the material gets erupted as ash and pumice rather than lava.
