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I'm sure someone can provide a better answer, but pressure built up in the magma under the volcano. When the pressure gets too great: eruption.
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∙ 12y ago
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Is a any volcano bigger than mt st Helens?
NO no volcano is bigger than Mt st Helens
Is moont st helens on land or sea?
Mt St Helens is on land.
What hemisphere is mt st Helens in?
Mt St Helens is located in two hemispheres: the northern and the western.
What mt range is mt st helens in?
ROCKIES
Is mt st Helens a violent or nonviolent volcano?
Mount St Helens is violent.
Where was the explosion of mt st Helens?
At Mt. St. Helens.
What Volcano in the northwestern US?
Mt. St. Helens Mt. St. Helens
How many miles is Tacoma from Mt Rainier and Mt St Helens?
About 92 miles to Mt. St. Helens from Tacoma
When was the first eruption of mt st helens?
Mt St Helens first erupted on May 18, 1980
Is a any volcano bigger than mt st Helens?
NO no volcano is bigger than Mt st Helens
Whice state is mount st Helens you?
Mt st. Helens is in Washington.
Is moont st helens on land or sea?
Mt St Helens is on land.
Where is Mt St Helenas?
mt. st. helens is in the state of Washington
Mountain Range home to Mt St Helens?
Mt. st. Helens is part of the High Cascade Range of mountains.
What hemisphere is mt st Helens in?
Mt St Helens is located in two hemispheres: the northern and the western.
What mt range is mt st helens in?
ROCKIES
What is mount st helens landmark?
Mt St Helens is located in Skamania,County
