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A fold axis outlines the ridge of _____.

-a fault
-a hill
-tilted rock strata
-rock units

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A fold axis outlines the ridge of a hill.

User Alice
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A fold axis outlines the ridge of a hill. By definition, a ridge is the narrow hilltop of a mountain range. This is why when they are drawn on maps, they appear as a fold axis. Its curvature shape is what makes it a unique element of topographic maps, and make it easier for people to identify them when needed.
User BigDataKid
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