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The most obvious effect of pressure on rocks is

  • A.Foliation
  • B.Lineation
  • C.Lithification
  • D.The reorientation of mineral crystals

Answer: D

The most obvious effect of pressure during metamorphism is the reorientation of mineral crystals: platy minerals such as mica rotate and regrow so that their flat faces lie at right angles to the direction of greatest stress.

Foliation and lineation are the visible textures this reorientation produces, so they are its results rather than the effect itself. Lithification is the compaction of sediment into rock and is not a metamorphic process at all.

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