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Magma in mantal is under great heat and high temperature. Once there is a crack or we called a line of weakness appears on crust's surface,magma would escae to the surface from mantal.Volcanic ashes,gases and magma would throw out and causes volcanic eruptions.

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13y ago
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14y ago

Since the magma is always building up pressure and the earth is always spinning, it sometimes causes a crack in the earth. The two sides of the crack may shift. This is called plate tectonics, known to be the cause of volcanic eruptions. The magma will burst through the crack. When magma comes out or erupts, it is called lava. If this crack is in the ocean, an island can be created. After it erupts numerous times, a cone is created. When there is an eruption in a volcano, the place where pressure builds up and where the magma is is called the magma chamber.

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14y ago

The amount of pressure that pushes up the magma in a volcano

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13y ago

The factors are: Viscosity, Dissolved Gasses, Volcanic Materials, and Pyroclastic Materials. :) :P

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14y ago

magma and heat preasurizing

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12y ago

lava

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Q: What is the cause of volcanic eruption?
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