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Answer :
Final answer:
The igneous rock described in the question, which has recrystallized deep beneath the Earth's surface and consists of 70 percent pyroxene, 15 percent plagioclase feldspar, and 15 percent olivine, is called gabbro. Unlike granite or rhyolite, gabbro is a coarse-grained rock with a significant amount of pyroxene and olivine.
The Option 3 is Correct
Explanation:
The rock described in the question, with a composition of 70 percent pyroxene (augite), 15 percent plagioclase feldspar, and 15 percent olivine, is an igneous rock.
Because it recrystallized deep below the Earth's surface, it is referred to as an intrusive or plutonic rock. Considering its mineralogical composition, it fits the description of gabbro. Unlike other choices, granite and rhyolite, gabbro is a coarse-grained rock with significant amounts of pyroxene and olivine.
On the other hand, granite does not contain these minerals - it's primarily made up of quartz and feldspar. Rhyolite is the extrusive equivalent of granite, while for gabbro, the equivalent is basalt, which is a fine-grained rock composed mainly of plagioclase and pyroxene.
However, basalt's formation typically takes place at the Earth's surface, not deep below it.
The Option 3 is Correct.
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