Consider the following statements with regard to igneous rocks: I. These rocks cannot be changed into metamorphic rocks. II. When molten material is cooled slowly at great depths, mineral grains tend to be very small. III. These rocks are known as primary rocks. Which of the statements given above is/are correct?
III only
Statement I is incorrect: igneous rocks can transform into metamorphic rocks when subjected to heat and pressure, as described in the rock cycle. Statement II is incorrect: when molten material cools slowly at great depths, crystals get more time to grow, so mineral grains tend to be large and coarse, not small. Statement III is correct: igneous rocks form directly from the solidification of magma and are therefore known as primary rocks, since sedimentary and metamorphic rocks are ultimately derived from them. Hence, only III is correct.
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