Igneous rocks that have the lowest content of silica are known as______

felsic rocks

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porphyry

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mafic rocks

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ultramafic rocks

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Solution

The correct option is B ultramafic rocks
Ultramafic rocks are the igneous rocks that have the lowest content of silica.

Felsic rocks- rich in feldspar and silicon (igneous rock).
Porphyry- igneous rock having feldspar & quartz crystals.
Mafic rocks- igneous rocks rich in magnesium and iron.

Thus the answer is Ultramafic rocks.

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