Discussion
The silica range that defines a basic igneous rock is
Answer: B
Correct answer: 45 to 52 per cent
Basic rocks contain 45 to 52 per cent silica - basalt and gabbro are the type examples. Below 45 the rock is ultrabasic, such as peridotite; above 52 it is intermediate. The silica-poor melts crystallise the ferromagnesian minerals in abundance, which is why basic rocks are dark and dense.
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