rocks

Essay specific features

 

Issue:

Science

 

Written by:

Catherine S

 

Date added:

November 5, 2011

 

Level:

University

 

Grade:

A

 

No of pages / words:

3 / 769

 

Was viewed:

1093 times

 

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Essay content:

This magma can be derived from partial melts of pre-existing rocks in either the earths mantle or crust. Typically, the melting is caused by one or more of the following proceses. an increase in temprature a decrease in pressure, or a change in composition. Over 700 types of igneous rocks have been described, most of them formed beneath the surface of the Earth's crust...
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Igneous are important because their minerals and chemistry give information about the compisition of the earths mantle. their features are usually characteristic of a specific tectonic environment. in some special circumstances they host important mineral deposits like tungsten uranium and tin. There are also two more kinds of igneous rocks there is intrusive and extrusive...
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