What Causes Volcanic Eruptions?


A volcano erupts when magma escapes from inside the earth. Magma sometimes rises under enormous pressure, so it not only finds cracks in the earth's crust, it can also create them. When magma reaches the earth's surface it is called lava.
Q&A Related to "What Causes Volcanic Eruptions"
Volcanoes can be found all over the world; some are dormant, some active and others extinct. The reason why these volcanoes exist or have existed is because molten rock, called magma
Volcanic eruptions are caused when magma from the magma chamber of the Earth rises up the pipe and out of the vent. Magma is continuously supplied from the mantle of the Earth. Shield
Volcanic eruptions are caused by divergent tectonic plates pulling
"A volcano can be defined as a fissure in the crust of the earth erupting gases and molten lava. Volcano is a vent through which magma and dissolved gases are discharged. Magma
3 Additional Answers
Ask.com Answer for: what causes volcanic eruptions
Several factors trigger volcanic eruptions, including the buoyancy of magma, a build-up of pressure from the gases in the magma and an injection of new magma into a full magma chamber.
When a part of the earth's upper mantle or lower crust melts, magma forms. A volcano is essentially an opening or a vent through which this magma and the dissolved gases it contains are discharged.
A volcano is an opening or vent through which magma and dissolved gases are discharged from the earth's mantle. Volcanoes happen when rock melts underneath the earth's surface. Their mass remains the same while their volume increases, this makes the rocks to be lighter hence raising them towards the surface through buoyancy.
When a portion of the earth's lower crust or upper mantle melts, magma is formed. The magma and dissolved gases need to be discharged. The vent where this happens is actually the volcano. You can find more information here: http://www.scientificamerican.com/article.cfm?id=what-causes-a-volcano-to
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