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Why do Volcanoes Explode?

An explanation on why valcanoes explode, and why some do while others don't.
by

Sarah Lowe

on 16 October 2012

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Transcript of Why do Volcanoes Explode?

By: Sarah Lowe Why do Volcanoes Explode? Volcanoes explode when the magma, which is less dense than the rocks around it, rises to the surface, and tries to release the dissolved water and gases within it.
This then causes the volcano to "pop" spewing gases, ash and debris all around the surrounding areas, or even hundreds of miles away. Answer: Mount Saint Helen
-Erupted in 1980, at 8:32 am. (Washington, US.)
-The most devastating eruption in U.S. history. Example:

Some volcanoes have vents and conduits (Kon-dwits) that allow built up gasses ,and vapor in the magma to escape reliving some of the pressure within the magma chambers.
While some have these vents, others don't, so when the pressure in the magma chamber becomes to much to bare, an eruption occurs. Why don't all Volcanoes Explode? As the rock within the earth melts, it becomes magma.
The magmas volume increases while its mass remains the same, causing the density to drop. The change in density allows the magma to rise to the top of the magma chamber.
Eventually the pressure from the gasses trapped within the magma build up until the pressure is to much for the chamber to bare, causing an eruption.
Or when a magma chamber that's already at its full capacity is filled with a new batch of magma, the new magma pushes the old magma to the surface causing an eruption. Effects It has on Geology: The Grimsvotn Volcanoe
Erupted in 2011, ( most recently)
Sent a plume of ash and debris 12 miles into the air. Explanation: Answer: Mauna Kea ( maw-nuh kee-uh)
Means " White Mountain" in Hawaiian
Hasn't erupted since 2460 BC Example: Constantly changes and reshapes the earth's surface.
Releases gasses such as Carbon monoxide, and other deadly gases into the air we breathe.
Acid rain, poor air conditions, and health problems after prolonged exposure to the harmful gases and ash.
Provides very fertile soil conditions, and adds water into the atmosphere ( slowly, from volcanic gases) The End. Example:
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