Discussion
A granite of density 2.65 and a gabbro of density 3.00 differ in mass, for the same volume, by about
Answer: B
Correct answer: 13 per cent
The difference relative to the granite is (3.00 - 2.65)/2.65 = 0.132, about 13 per cent. It reflects the ferromagnesian minerals of the gabbro against the quartz and feldspar of the granite, and it is why basic and ultrabasic rocks stand out on a gravity survey and why the oceanic crust, being basaltic, is denser than the continental.
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