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The magma of the Hawaiian volcanoes has a basaltic composition, which means it has a low viscosity (it flows easily) and so can erupt easily without needing too much force behind it. This low viscosity magma cannot hold very much gas and so erupts effusively By contrast, the magma involved in the 1980 eruption of Mount St Helens had a dacitic composition, which has an extremely high viscosity. The high viscosity allows large mounts of gas to be stored in the magma under pressure. When the magma was exposed to lower pressure near the surface, the gas was released and expanded explosively, blasting the magma into ash and pumice.
What else can I help you with?
What type of eruptions does mount st Helens do?
Like most stratovolcanoes, Mount St Helens alternates between explosive and effusive eruptions.
Where has there been volcanic eruptions?
mount st helens
What is the history of Mount St Helens?
It had not erupted for a few years but there small eruptions and earthquakes but when Mount ST Helens erupted i shocked everyone
How many eruptions have been recored of mount st helens?
564,894,885,465
What are the benefits of eruptions of mt St Helens?
Mt. St. Helens benenfited humans by the rock from lava are used to build and repair roads in this day!
How many deaths occured in the mount St Helens eruptions?
The 1980 eruption of Mount St. Helens killed 57 people.
What are two major volcanic eruptions that have occurred in the last 100 years?
Two major volcanic eruptions that have occurred in the last 100 years are the eruption of Mount Pinatubo in the Philippines in 1991, and the eruption of Eyjafjallajökull in Iceland in 2010. Both eruptions had significant impacts on their surrounding regions and beyond.
What was the majors eruptions of mt st Helens?
The major eruptions of mt st Helen where that it was very active and the ground in the volcano always had a earth quake and so the made the eruptions in mt st Helen still active but was deadly in the 1900s.
Is mount st helens explosive or nonexplosive?
Mount St. Helens is known for its explosive eruptions. In 1980, it erupted violently and produced a massive explosive eruption that caused significant devastation to the surrounding area. Subsequent eruptions have also been explosive in nature.
Is mt st helens non-explosive or explosive?
Mount St. Helens is generally regarded as an explosive volcano, but like most stratovolcanoes, it can produce both explosive and non-explosive eruptions.
Why is Mt St Helens eruption so well known?
Because I think it was one of the biggest eruptions.
Why quiet eruptions on the Hawaiian islands?
Hawaii's volcanos are quite compared to Mt St Helens because Mt St Helens blew up from a earthquake of two plates shifting making the volcano vary voilent and loud which blew one half of the volcano
