When the plunge said to be zero, then the axis of the fold is said to be ____________
(a) Vertical
(b) Horizontal
(c) Inclined at 60° to the horizontal
(d) Inclined at 60° to its normal.
This question was posed to me in an interview for internship.
This interesting question is from Parts of a Fold in portion Folds and Folding of Engineering Geology