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level: Igenous Rocks Composition

Questions and Answers List

level questions: Igenous Rocks Composition

Question	Answer
Dark silicate minerals and calcium-rich plagioclase feldspar (but no quartz)	Basaltic Composition
_______ is the main constituent of the upper mantle	perioditite
_______ is the main constituent of the upper mantle	peridotite
_______ is the main constituent of the upper mantle	peridotite
Naturally occurring solid that is made up of minerals	Rocks
Magma or lava that cools down and crystallizes/solidifies	Igneous Rocks
___________ exhibit nearly white to black coloration and can contain fragments/ash or holes	Igneous Rocks
Igneous Rock are composed mainly of ________ minerals	silicate
4 Compositions of Igneous Rocks	Granitic; Basaltic; Andesitic; Ultramafic
Light-colored silicates (quarts and potassium feldspar) are dominant minerals	Granitic Composition
Geologists refer to granitic rocks as ______ , a term derived from feldspar and silica (quartz)	felsic
Most granitic rocks contain _____ percent of dark silicate minerals (biotite mica and amphibole)	10
________ are major constituents of the continental crust	Granitic Rocks
Dark silicate minerals and calcium-rich plagioclase feldspar (but no quartz)	Basaltic Composition
Basaltic rocks contain at least ___ percent of dark silicate minerals	45
Geologists refer basaltic rocks as ______ because of high percentage of dark silicate minerals	mafic
_________ make up the ocean floor as well as many of the volcanic islands located within the ocean basins	Basaltic rocks
Intermediate composition between granitic and basaltic igneous rocks	Andesitic Composition
Intermediate rocks (andesitic rocks) contain at least ____ percent dark silicate materials	25
This important category of igneous rocks is associated with volcanic activity	Intermediate Rocks
Perioditite,contains mostly olivine and pyroxene and thus falls on the opposite side of the compositional spectrum from granitic rock	Ultramafic Composition
Because perioditite is composed almost entirely of ferromagnesian minerals, its chemical composition is referred to as _______	ultramafic
_______ is the main constituent of the upper mantle	perioditite