Mount St. HelensBy Callum

Where is it?Mount St. Helens is

located in Washington State. Washington State is in the North West region of the United

State and is above Oregon State. It is around 100

miles from Seattle and 50 miles from Portland.

About Mount St. Helens

Mount St. Helens is 4,400 feet high at its highest point.It is also around 6 miles wide at the base! The snow on the slopes of Mount St. Helens is usually 15 feet deep, but it can get as

deep as 25 feet at some times.Mount St. Helens is a composite volcano, and it is less than 3,000 years old, making it younger than the Great Pyramid of Egypt.

The EruptionThe Mount St. Helens

eruption was the deadliest volcano

eruption in USA history. The eruption occurred on May 18, 1980 and killed 57 people. As well as that, 200 miles of

highway were destroyed and 250 homes were

destroyed.

The Eruption (Pt.2)

There was only one lucky thing that happened in the eruption, if the eruption had happened one day later, the death poll

would almost certainly be doubled. The cost of the

eruption is about 223 million dollars(Due to reinforcing the highways and bridges, about $170 million and the care

centers and visitor centers, about $50 million).

After the Eruption

Many citizens died during the Mount St. Helens eruption. Most of the deaths, due to the ash

cloud. The ashfall cloud was 40 miles wide and 25 miles high. Most of the deaths

were direct, but some of the deaths were indirect. For example, four people were killed indirectly in a car crash, because of the poor

visibility.

After the Eruption (Pt.2)

As well as all that, the Toutle River was flooded from all the melted snow

and ice from the mountain.About 12 million feet of lumber were swept into the river, however debris dams were made to help control the sediment

in the rivers.

After the Eruption(Pt.3)After the eruption, 30

logging trucks, 22 transport vehicles,and 39

railcars were either damaged permanently or

destroyed, along with 4.7 billion board feet of timber. Shipping was

stopped on the Colombian river, and some vessels

were even stranded.

Effects on People

For a limited time, some people living near the eruption suffered from post traumatic stress

syndrome like depression, troubled sleep,

irritability, and a sense of being powerless.

Tectonic Plate Boundaries

The plate boundary that created Mount St. Helens was

destructive. A destructive plate boundary happens when two or more plate tectonics move

towards each other and collide. Volcanoes and earthquakes are

common near this plate boundary because of pressure and

friction. When the plates move towards each other, the create either a subduction zone or a

continental collision.

Tectonic Plate Boundaries

(Pt.2) It all depends on the plates

involved. In a subduction zone, the subducting plate(usually the oceanic plate) will move beneath the other plate, which can be

either an oceanic or continental plate. Continental collisions happen when to continental

plates collide, which creates large mountain ranges.Mount St.

Helens was part of the subduction zone process.

Why did the Eruption Happen?

The 1980 eruption of Mount St. Helens was caused because of the North American Continental plate

and the Juan De Fuca Oceanic Plate.When the two plates moved together, the oceanic plate went under the continental because

the oceanic is much heavier. The temperatures rose, due to magma and friction, and it caused the crust to melt, adding to the

existing magma.

Why did the Eruption

Happen(Pt.2)Because of the melting, bubble gases were produced, which made

the magma rise closer towards the surface. The pressure was immense, and it triggered a 5.1 magnitude

earthquake.The earthquake caused a vast bulge on volcano to

collapse,and create a debris avalanche. This released the pressure on Mount St. Helens, causing gas and steam to be

explosively expelled, making the famous eruption.

Is Mount St. Helens related to the Earth’s Crust?Mount St. Helens is tied in

with the Earth’s crust.First of all, Mount St. Helens erupted because of the Earth’s crust. The

Earth’s crust is made up of plates, which move to cause friction, and eventually

cause volcanoes and earthquakes to be

triggered.

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