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Assertion: the width of a bed's outcrop equals its true thickness. Reason: the ground surface cuts the bed at right angles.

  • A.the assertion is true but the reason given for it is false
  • B.both the assertion and the reason are false except for a vertical bed
  • C.both the assertion and the reason are true and the reason explains the assertion
  • D.both the assertion and the reason are true but the reason does not explain the assertion

Answer: B

Level ground cuts a vertical bed at right angles, and only then do width and thickness coincide. For any other dip the width is the thickness divided by the sine of the dip, so it exceeds the thickness sometimes greatly.

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