Normal faults occur in areas undergoing extension (stretching). If you imagine undoing the motion of a normal fault, you will undo the stretching and thus shorten the horizontal distance between two points on either side of the fault. If you stood on the fault plane, the block on the right would be under your feet.
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Answer:
Normal faults occur in areas undergoing extension (stretching). If you imagine undoing the motion of a normal fault, you will undo the stretching and thus shorten the horizontal distance between two points on either side of the fault. If you stood on the fault plane, the block on the right would be under your feet.