CDS 2026 (I) General Knowledge, question 67

Topic: Geography

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Q67

Which one among the following statements regarding igneous rock is correct ?

  1. (a) When magma cools deep in the Earth’s interior, it results in the formation of fine-grained igneous rocks.
  2. (b) Basalt is a type of intrusive igneous rock.
  3. (c) Most of the minerals of igneous rocks are silicates.Correct answer
  4. (d) Extrusive igneous rocks often undergo lithification.

Solution.

Answer: (c) Most of the minerals of igneous rocks are silicates.

  1. Silicates dominate most igneous rocks.
  2. Slow cooling at depth generally produces coarse crystals, not fine grains; basalt is normally extrusive; and lithification refers principally to the conversion of sediment into sedimentary rock.