Multiple choice

Which of the following statements is/are correct in relation to igneous rocks?

  1. They are called ‘primary rocks’.
  2. Extrusive igneous rocks are very fine-grained.
  3. Basalt is a typical example of extrusive igneous rocks.

  1. All 1, 2 and 3

  2. Only 1

  3. Only 1 and 2

  4. Only 2 and 3
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A Correct answer
Explanation

Igneous rocks are also called ‘primary rocks’ because they were the first ones to be formed. ‘Extrusive igneous rock’ is the name given to magma erupting and solidifying on reaching the earth’s surface. As magma cools down rapidly on reaching the earth’s surface, so these rocks are very fine-grained. Basalt is a typical example of extrusive igneous rocks.

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