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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Rahul kumar
Answer: 90° Plunge of fold axis in vertical fold (vertical axial plane and vertical fold axis) = 90° Plunge of fold axis in horizontal Upright fold (horizontal fold axis and vertical axial plane) = 0° So, the sum of plunges= 90° + 0° = 90°