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Igneous Rocks

The oceanic c...

Question

The oceanic crust consists mainly of _________.

A

basaltic rocks

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B

granitic rocks

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C

gabbroic rocks

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D

ultramafic rocks

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Solution

The correct option is A basaltic rocks
The oceanic crust consists of a volcanic lava rock called basalt. Oceanic crust is the thin crust underlying the oceans. Basalt is dark coloured igneous rock mainly composed of pyroxene mineral. It most commonly forms as an extrusive rock, such as a lava.

Basalt density present is equal to 3.0 g cm'3

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