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- 1. Mount St. Helens ByCallum
- 2. Where is it? MountSt. 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.
- 3. About Mount St. Helens MountSt. 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.
- 4. The Eruption The MountSt. 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.
- 5. The Eruption (Pt.2) There wasonly 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).
- 6. After the Eruption Many citizensdied 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.
- 7. After the Eruption (Pt.2) As wellas 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.
- 8. After the Eruption(Pt.3) After theeruption, 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.
- 9. Effects on People For alimited time, some people living near the eruption suffered from post traumatic stress syndrome like depression, troubled sleep, irritability, and a sense of being powerless.
- 10. Tectonic Plate Boundaries The plateboundary 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.
- 11. Tectonic Plate Boundaries (Pt.2) It alldepends 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.
- 12. Why did the Eruption Happen? The1980 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.
- 13. Why did the Eruption Happen(Pt.2) Becauseof 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.
- 14. Is Mount St. Helensrelated 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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- 16. Bibliography 2 http://www.uhh.hawaii.edu/~csav/gallery/galleryarchival.php http://www.nasa.gov/mission_pages/landsat/news/40th-top10-st-helens.html http://blog.oregonlive.com/environment_impact/2009/02/helens.jpg http://www.rgs.org/NR/rdonlyres/C62A6824-C12E-4D6C-A879-14ED8240CA04/0/ CGT_NetRaising_8StHelensessay.pdf http://www.weatherwizkids.com/weather-volcano.htm http://www.learner.org/interactives/dynamicearth/images/new_map.jpg http://www.guidepost.es/wp-content/uploads/2013/05/7.-Mount-St.-Helens-Aftermath-w-Drawing.jpg http://www.lawyersgunsmoneyblog.com/wp-content/uploads/2014/05/738-567-mt-st-helens.jpg http://www.bbc.co.uk/schools/gcsebitesize/science/images/earthcrosssection.gif