Igneous rocks close igneous rockIgneous rocks are those which have been formed by the cooling and solidification of molten rock (magma) from underneath the earth’s crust. are formed by magma ...
is made up of different layers that consist of different types of rock. One of the most common types is an igneous rock high in silica content called peridotite. In the past, when geologists compared ...
the igneous, metamorphic and sedimentary rocks. Figure 1.1: Approximate mineral compositions of the more common types of igneous rocks, e.g. granite approximately 40% orthoclase, 33% quartz, 13% ...
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