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Mt. St. Helens has erupted a very broad spectrum of igneous rocks. Primarily it is known as an explosive volcano meaning that it most commonly erupts Dacite, which has a high amount of silica present in the rock. However, throughout the geologic history of the volcano it has erupted everything from Basalt (very fluid, Hawaiian style) magma, to Rhyodacite (very sticky, explosive) style of magma. The silica content in a volcanoes magma supply primarily determines if the volcano will tend to have an explosive type of eruption or if it will tend to fountain lava. Mt. St. Helens having primarily Dacite tends to be a commonly more explosive volcano when it goes through its eruption periods. For a further detailed geologic history of Mt. St. Helens please see related links to the Geologic History of Mt. St. Helens as provided by the United States Geological Survey, Cascades Volcano Observatory.
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What rock type is mount st Helens?
Mount St. Helens is predominantly composed of andesite, which is an intermediate volcanic rock that forms from the partial melting of the Earth's crust. This type of rock gives Mount St. Helens its characteristic gray color and is related to the volcanic activity in the area.
What rock forms when magma erupts and cools at the earth?
igneous rock
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.
What kind mountain is mount st Helens?
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is part of the Cascade Range. The mountain is well known for its catastrophic eruption in 1980 which dramatically changed its landscape.
Were is mount st Helens located?
Mount St Helens is located in Skamania County, Washington.
What kind of rock did Mt St Helen eject?
Mount St Helens primarily erupts dacite.
What rock type is mount st Helens?
Mount St. Helens is predominantly composed of andesite, which is an intermediate volcanic rock that forms from the partial melting of the Earth's crust. This type of rock gives Mount St. Helens its characteristic gray color and is related to the volcanic activity in the area.
What rock forms when magma erupts and cools at the earth?
igneous rock
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.
How can rock form when a volcano erupts?
The rock forms over a cooling process.
What forms when volcanoes erupts and the lava cools?
the lave cools and forms igneous rock
What kind of material does mount stromboli erupts?
hard rock black rock lava by smartman this is true
What material is mount st helens made of?
by ash, rock, lava, and gas
What kind mountain is mount st Helens?
Mount St. Helens is an active stratovolcano located in Skamania County, Washington, in the Pacific Northwest region of the United States. It is part of the Cascade Range. The mountain is well known for its catastrophic eruption in 1980 which dramatically changed its landscape.
Were is mount st Helens located?
Mount St Helens is located in Skamania County, Washington.
What kind of rock is formed after a volcano erupts?
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.
What type of rock is around mt st Helen's?
Mount St Helens is composed primarily of dacite.
