Discussion
Beds dipping at 25 degrees out of a rock face cut at 50 degrees present
Answer: D
Correct answer: a plane on which a block may slide
Planar sliding requires the discontinuity to dip out of the face - to daylight - and to dip less steeply than the face but more steeply than its friction angle. Here the bedding dips at 25 degrees out of a face cut at 50, so it daylights and the condition is met. Toppling would require steep discontinuities dipping into the face, and circular failure occurs in soil or heavily broken rock with no dominant plane.
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