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WAEC Geography 1992 Question 15

Question 15

Rocks

Basalt differs from granite because it

  1. A.does not contain fossils
  2. B.is crystalline in structure
  3. C.is richer in iron and magnesium oxides
  4. D.is an igneous rock
  5. E.is formed from magma
Show the answer and explanation

Answer: C (is richer in iron and magnesium oxides)

Explanation

Both are igneous and crystalline, but basalt is a basic rock rich in iron and magnesium; granite is acidic (silica-rich).