How Do Volcanoes Erupt?

Answer

Pressure and high temperatures beneath the earth's crust causes rocks to melt down. Melted rock turns into a liquid form known as magma, the magma seeps through Earth's crust and makes its way above the rock formations and eventually into rivers of magma that form underneath a volcano's surface. Magma chambers fill and pressure is built between the liquids and gases that come from the magma. Water is the basis for the type of eruption that occurs. When minimal water is present in the flowing magma, the magma seeps out onto land and becomes lava.
Q&A Related to "How Do Volcanoes Erupt"
1. Lay the wax paper out on a flat surface. 2. Roll the modeling clay in your hands to warm it up. This will make it easier to work with it. 3. Make a mountain out of the clay. 4.
http://www.ehow.com/how_4927752_make-volcanoes-eru...
Very broad question! Basically when a plate gets subducted under another the rock turns to molten rock and consequently becomes less dense. As the material is less dense it rises
http://www.quora.com/Why-do-volcanoes-erupt
To let the heat in the atmosphere to exit so it does not get too hot on earth.
http://wiki.answers.com/Q/What_is_the_purpose_of_a...
it erupt because plates move apart and the magma in the core comes to the vent.
http://wiki.answers.com/Q/What_causes_the_Sakuraji...
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Ask.com Answer for: how do volcanoes erupt
How Do Volcanoes Erupt?
The process of a volcano erupting begins with the generation of magma, which then migrates towards the surface until the pressure and temperature can equalize. Find out why sometimes there is merely a cooling and crystallization below the surface of a... More »
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Source: www.ehow.com
Volcanic eruptions occur when magma forces itself to the earth's surface through weak points such as cracks and fissures on the earth's surface. Movement of tectonic plates is a major cause of magma movement.
Volcanoes erupt when hot molten rock forces itself to the earth's surface usually as a result of the movement of tectonic plates beneath the earth's crust. This forces magma to escape to the earth's surface through weak points such as cracks and fissures.
Volcanoes usually occur or erupt on the edges or sides of plates where earthquakes usually occur. Most of the volcanoes occur in the Pacific Ring of Fire which is the Pacific Ocean's edge. They also occur in hotspots or in the middle of plates.
Most volcanoes usually occur near the edges of plates. Volcanoes happen because the Earth's crust is broken down into plates that look like a jigsaw puzzle. As the plates shift or move, they slide against each other or draw apart.
Volcanoes erupt when pressure builds up inside the earth's crust. This part of the crust is called the mantle. The temperature also increases as the pressure gets stronger. You can find more information here: http://www.universetoday.com/guide-to-space/earth/volcanic-eruption/
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