Discussion
Slickensides on a rock surface are evidence of
Answer: A
Correct answer: fault movement
Slickensides are the polished, striated surfaces produced when two blocks grind past each other along a fault plane, and the striations record the direction of the last movement. They are direct evidence of faulting, and their orientation is used to determine the slip direction. Glacial abrasion produces striations too, but on an exposed land surface rather than on a fracture plane within the rock.
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