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Like so many volcanic eruptions it was caused by the rising of magma where an oceanic plate, the Juan de Fuca, descends under the continental North American plate. The resulting friction causes heat which turns the destroyed Oceanic crust into magma. Over time the build up becomes so great that it forces its way to the Earth's surface.
Wiki User
∙ 13y ago
Wiki User
∙ 11y agoThe North American and Juan de Fuca plate, a destructive plate boundary
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What kind of volcano is Mount St. Helens in Washington?
Mount St. Helens, an active stratovolcano, is of the composite type.
What was the most disasteris volcano?
Mount St. helens
Is mt st Helens a violent or nonviolent volcano?
Mount St Helens is violent.
What is the name of a volcano that erupted?
Any volcano? Mount St. Helens is one.
Where was the most powerful avalanche?
The Mount St. Helens volcano was the strongest volcano
What are eviromental effects caused by mount st helens volcano?
me mum in a wetsuit
Is mount saint helens a composite volcano?
Yes. Mount St. Helens is a composite volcano.
What kind of volcano is Mount St. Helens in Washington?
Mount St. Helens, an active stratovolcano, is of the composite type.
When did mount saint Helens errupt?
Mount Saint Helens errupted on May 18,1980 at exactly 8:32 am.It destroyed many things and killed people.
What is the volcano that erupted in the state of Washington in 1980?
mount st Helens
How are mount st Helens and Mount Etna different?
mount st helens errupted from the side whilst no other volcano does that
Is Mount St Helens an active volcano?
Yes it is an active volcano.
What country is volcano mount St Helens in?
Mount St. Helens is in Washington state in the United States ofAmerica.
What volcano is close to mount saint Helens?
Mount Saint Helens is the valcano. It's pretty close to itself.
What type of mountain is mount st helens)?
Volcano.
What type of landform is mount st helens?
Volcano
What is the name of a volcano in America?
Mount St. Helens
