ANSWER: The tilting of the layers of rock occurred before erosion of the unconformity surface. It is an angular unconformity because layers of sedimentary rock are above and below the unconformity and the layers above and below are not parallel. It is an angular unconformity because it is at an angle to the ground surface instead of parallel. It is an angular unconformity because the layers of sedimentary rock above and below the unconformity are at the same angle.

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