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WAEC Geography 2019 Question 15

Question 15

Structure of the Earth

The density of the Earth's crust varies from

  1. A.17.0 g/cm3 to 19.5 g/cm3.
  2. B.8.0 g/cm3 to 10.9 g/cm3.
  3. C.4.5 g/cm3 to 7.0 g/cm3.
  4. D.2.5 g/cm3 to 3.3 g/cm3.
Show the answer and explanation

Answer: D (2.5 g/cm3 to 3.3 g/cm3.)

Explanation

Crustal rocks are light: about 2.7 (sial) to 3.0 (sima) g/cm³.