Definition of magma - What it is, Meaning and Concept

The notion of magma comes from a word of the Greek language that can be translated as "pasta" .The term makes reference to the molten rock mass found inside the planet Earth.

Magma is a mixture of solid, volatile and liquid materials .it crystallizes and consolidates, giving rise to the igneous rocks .When crystallization occurs inside the Earth , it is intrusive or plutonic rocks ; instead, if magma rises to the surface, it becomes lava and just then cools, it generates effusive or volcanic rocks .

The magmatism is the magma formation process.It is usually carried out at the edges of the tectonic plates, below the ocean ridges, although it can also be realized in areas located in the inside the plates and in the subduction areas.

When high temperatures are combined with high levels of pressure , the rocks merge and become in magma.This substance can only be found underground because, when arriving abroad, it is called lava .

Magma is usually concentrated in underground chambers (the so-called magma chambers ).Alli keeps the molten mass that includes a liquid part, fragments of crystals and rocks and different dissolved gases.magma allow feeding the volcanoes .

Many times volcanic eruptions occur when the vapor pressure of gases becomes greater than the pressure exerted by solid rocks that keep magma confined.This generates the appearance of multiple bubbles that try to "escape" until the eruption takes place and the magma is expelled as lava.

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