Volcanoes

Sam Studer

What is it?

An opening in the earth's crust from which lava, ash, and hot gases flow or are ejected during an eruption.

What causes it?

Volcanoes happen when magma rises to the surface of the earth, which causes bubbles of gas to appear in it. This gas can cause pressure to build up in the mountain, and it eventually explodes.

Where do they occur?

Most volcanoes occur near the edges of plates.

Can it be predicted? How?

Volcanologists can predict eruptions, if they have a thorough understanding of a volcano's eruptive history, if they can install the proper instrumentation on a volcano well in advance of an eruption, and if they can continuously monitor and adequately interpret data coming from that equipment.

How can we prevent people from dying?

We could either evacuate the city and make sure that everyone is away from the volcano. Another way is to get everyone underground in a safe and secured place.

What can you do in your own home to prepare?

You should of all things, you need to be educated on what could happen during a eruption. Second you need a secure shelter that can be protected from the ash and the debris.

Mount St. Helens, Washington

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When did it happen?

Sunday May 18, 1980 at approximately at 8:32 a.m.

Where did it happen?

Southwestern Washington, United States
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Interesting Facts

- The most economically destructive volcanic event in U.S. history.

- The volcanic ash cloud drifted east across the United States in 3 days and encircled Earth in 15 days.

- Small plants and trees beneath winter snow, and roots protected by soil, survived the May 18, 1980 eruption and now thrive.

Cause of eruption

The Juan de Fuca oceanic plate and the North American continental plate move due to convection currents in the mantle and resulted in a very violent eruption.

Death Toll

57 people plus a plane crash and a traffic acciddent killing 7 more.

Damages after eruption

The major damages of the eruption were that the ground was still very hot even knowing that the eruption was over for about 2 hours, took out power lines, destroyed houses and other buildings, killed all the animals and plant life surrounding the volcano and farther out.

Before and after pictures of the eruption

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Citations

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PUBLISHED Thu May 20 14:12:00 EDT 2010. "Mount St. Helens Pictures: Before and After the Blast." National Geographic. National Geographic Society. Web. 15 Oct. 2015.


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