Multiple choice

Which of the following characteristics are associated with great masses of metamorphic rocks generally resulting from regional metamorphism?

  1. Such rocks become wholly crystalline
  2. Such rocks become partially crystalline.
  3. A streaking or parallel arrangement of their constituent crystals which lie with their longer axes pointing in the same direction.

  1. 1, 2 and 3

  2. 1 and 2

  3. 2 and 3

  4. 1 and 3
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C Correct answer
Explanation

Regional metamorphism affects large areas under high pressure and temperature but varying conditions. The rocks become partially crystalline (not wholly) due to differential metamorphism. The parallel arrangement of crystals (foliation/schistosity) with longer axes aligned in the same direction is characteristic of regional metamorphic rocks like gneiss and schist.

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