Volcanoes
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PRESENTATION OUTLINE
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- An earthquake-triggered landslide unleashed a sideways blast of hot gas and ash from this famous stratovolcano volcano (also known as a composite volcano) in the state of Washington, USA.
PLATE BOUNDRY
- Mt. St. Helen is on the Juan de Fuca plate, which is a tectonic plate and is subducting under the northerly portion of the western side of the North American Plate at the Cascadia subduction zone.
MEASURE OF EFFECT
- The way Mount St. Helen was measured was by how much above sea level it was
SCIENTIFIC REASON
- Magma rises through cracks or weaknesses in the Earth's crust. When this pressure is released, eg as a result of plate movement, magma explodes to the surface causing a volcanic eruption. The lava from the eruption cools to form new crust. Over time, after several eruptions, the rock builds up and a volcano forms.
