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Unilorin Post-UTME Geography 2024 (Model questions) Question 3

Question 3

Rocks

Which of these is an intrusive igneous rock?

  1. A.Gabbro
  2. B.Andesite
  3. C.Basalt
  4. D.Pumice
Show the answer and explanation

Answer: A (Gabbro)

Explanation

Gabbro cools slowly deep underground, giving large crystals. Andesite, basalt and pumice cool quickly at the surface, so they are extrusive.