project

our project is about volcanoes oh  sorry about the components of magma The magma is composed of

highly volatile materials to escape during the cooling process, or
low volatility materials finally solidified, so
as
a cluster lead compound, in most cases, quartz, feldspar and mica, and a
secondary cluster (eg, zircon, apatite, magnetite, etc..) that is less important compared with the principal.
The fraction volatize scarcely be composed primarily of SiO2, as well as oxides of Al, Fe, Ca, Mg, Na and K (minor), whose participation is relatively low because the SiO2 content ranges between 50 and 75%. Unlike sediments, magmatites remain within a narrow framework of normality from a mineralogical point of view.

The party easily volatize is composed mainly of H2O, CO2, HCl, HF, H2S, among others. Your total amount in the magma is not significant (only a very small percentage of weight), however, it influences the solidification of magma

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 this is take from http://www.lateinamerika-studien.at/content/natur/naturesp/natur-221.html