Volcanoes And Magma
Magma is molten rock and the other materials contained within: gases, liquids, solids. Magma reaching the earth's surface is expelled through a volcano. It is a vent from lower regions of the earth.
Lava is a river of molten magma. Magma may also be explosively expelled and be in the form of super heated gases and tiny hot particles.
As with most things in geology, magma too can be characterized and compartmentalized. Three distinct types of magma are more common than all others and are described by the following:
Composition and in particular percentage silica.
Dissolved gases in magma are very important in determining the physical characteristics of the magma. Even at low concentrations 0.2 - 3% they have tremendous effect.
The main gases are H2O, and CO2 (98%)gases that sometimes achieve 1% are SO2, HCl, N2 and Ar.
Lava is a river of molten magma. Magma may also be explosively expelled and be in the form of super heated gases and tiny hot particles.
As with most things in geology, magma too can be characterized and compartmentalized. Three distinct types of magma are more common than all others and are described by the following:
Composition and in particular percentage silica.
Dissolved gases in magma are very important in determining the physical characteristics of the magma. Even at low concentrations 0.2 - 3% they have tremendous effect.
The main gases are H2O, and CO2 (98%)gases that sometimes achieve 1% are SO2, HCl, N2 and Ar.
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