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 ?
- A.I and II only
- B.III only
- C.II and III only
- D.I, II and III
Show answer
Igneous rocks are called primary rocks, but they can be changed into metamorphic rocks, and slow cooling gives large grains, not small ones.
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