Discussion
Assertion (A): Contours generated automatically from an elevation model are usually edited before publication.
Reason (R): An unedited line can wander in a way that no real slope does.
Answer: C
Both are true and the reason gives the cause: noise in the model produces small kinks and loops that would be read as landforms, so the lines are smoothed and tidied without moving them away from the heights they represent.
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