Question

An igneous rock including more than 65% silica, which is low in iron and magnesium

Answer 1

Answer:

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Explanation:

Felsic igneous rocks are rich in silica (in the 65-75% range, meaning the rock would be 65-75% weight percent SiO2) and poor in iron and magnesium. Intermediate is a composition between felsic and mafic. ... These rocks are rare on the surface, but make up peridotite, the rock of the upper mantle.

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