Discussion
A rock fall is distinguished from a slide by the material
Answer: B
Correct answer: travelling largely through the air
A fall detaches from a steep face and descends through the air, bouncing and rolling on arrival - there is no sliding surface and no continuous contact with the slope. A slide maintains contact and moves along a defined failure surface. The distinction governs the remedy: falls are dealt with by netting, catch fences and ditches, slides by drainage and by stabilising the surface itself.
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