Peridotite, which is composed almost entirely of dark silicate minerals and is believed to make up much of Earth’s upper mantle, has a composition that is _____.

granitic

ultramafic

andesitic

basaltic

Description

Peridotite is a dense, coarse-grained plutonic rock that is composed mostly of the minerals olivine and pyroxene. The composition of peridotite is ultramafic, as the rock has less than 45% silica and it has high magnesium content with significant amount of iron. Peridotite is economically valuable because it is a source rock for diamonds, and it is the major constituent of the upper part of the Earth's mantle.

Peridotite, which is composed almost entirely of dark silicate minerals and is believed to make up much of Earth’s upper mantle, has a composition that is _____. granitic ultramafic andesitic basaltic Description

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Peridotite, which is composed almost entirely of dark silicate minerals and is believed to make up much of Earth’s upper mantle, has a composition that is _____.

granitic

ultramafic

andesitic

basaltic

Description