Discussion
A fold is described as plunging when its axis is
Answer: A
Correct answer: inclined rather than horizontal
A fold axis need not be horizontal; where it is tilted the fold is said to plunge, and the amount is the angle of that inclination below the horizontal. On a map a plunging anticline appears as a nose closing in the direction of plunge, with the outcrop pattern forming a V or a horseshoe rather than parallel bands. Recognising the closure is what tells the mapper the fold plunges and which way.
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