Discussion
An acid igneous rock is one containing silica in excess of about
Answer: B
Correct answer: 66 per cent
The conventional divisions by silica content are: acid above 66 per cent, intermediate 52 to 66, basic 45 to 52, and ultrabasic below 45. Silica content correlates with almost everything else - acid rocks are rich in quartz and feldspar, pale and light; basic rocks are rich in ferromagnesian minerals, dark and dense - which is why it is the primary classification.
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