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https://www.youtube.com/watch?v=3zHgw...

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When did it erupt last?  How often does it erupt?

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When did it erupt last?  How often does it erupt?

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1980, almost a century.

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Can scientists predict a volcanic eruption?  If so, how?  What pieces of information do they use to help them make these predictions?

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Can scientists predict a volcanic eruption?  If so, how?  What pieces of information do they use to help them make these predictions?

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Yes, somewhat but it is very hard to do.  They predict a volcano’s vital signs. Seismometers can be used to pinpoint earthquakes which track the rise of magma and its movement. They Instruments that sniff SO2, CO2 and other gases also can signal changes in the volcano.

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Have there been any major fatalities associated with the eruption of this volcano in the past?

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Have there been any major fatalities associated with the eruption of this volcano in the past?

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YES

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Are there any other natural disasters (long and short term) that can occur due to a volcanic eruption?

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Are there any other natural disasters (long and short term) that can occur due to a volcanic eruption?

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Volcano's can cause earth quakes, tsunami's and damage to the land around where a volcano erupted.

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What are the precautions and emergency procedures that take place before and during a volcanic eruption? 

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What are the precautions and emergency procedures that take place before and during a volcanic eruption? 

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Stay out of the area defined as a restricted zone.  Avoid river valleys and low lying areas.
Safety Tips Before:

• Stay away from active volcanoes.

• If you live near an active volcano, keep goggles and a mask in an emergency kit, along with a flashlight and a working, battery-operated radio.

• Know your evacuation route. Keep gas in your car.

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  What causes it to be either explosive or non-explosive?  

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  What causes it to be either explosive or non-explosive?  

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Two important traits that characterize volcano's explosiveness and viscosity. A eruption begins when magma, the molten rock from deep in the Earth's crust, rises toward the surface. Dissolved gases in the magma determine weather it will be explosive or not.

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It depends, but has been recorded from 6 to 40 miles an hour.

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What type of magma (mafic, felsic, etc…) does it produce?

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What type of magma (mafic, felsic, etc…) does it produce?

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explosive pyroclastic eruptions

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What is happening in the Earth’s crust (at that plate boundary) that forms this volcano?

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What is happening in the Earth’s crust (at that plate boundary) that forms this volcano?

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The plates shift and seperate which lets lava flow up and harden. Eventually build a mountain form.

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Is it associated with a specific plate boundary?  If so, what type of plate boundary is it associated with?  

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Is it associated with a specific plate boundary?  If so, what type of plate boundary is it associated with?  

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Yes, the plate boundary is a subduction plate .

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plates push up and then spread apart causing the magma to come up and erupt.

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Composite volcanoes

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Mt. Saint Helen's volcano is a steep-sided volcano composed of many layers of volcanic rocks, usually made from high-viscosity lava, ash and rock debris.