Discussion
A plutonic igneous rock is one that crystallised
Answer: B
Correct answer: at considerable depth, cooling slowly
A plutonic or intrusive rock crystallises at depth, where the surrounding rock insulates it and cooling takes thousands of years, so the crystals grow large and the texture is coarse. Granite and gabbro are the familiar examples. A volcanic or extrusive rock, cooled at the surface in hours or days, has the same chemistry but a fine or glassy texture - rhyolite and basalt respectively.
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