In a region that has been deformed into a series of anticlines and synclines,

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Anticlines initially form ridges due to the arch-like shape of the rock layers being pushed upwards. However, because the rock layers on the outer sides of the anticline are often tilted away from the center of the structure, they are more exposed to erosion. Over time, this can lead to the anticline being eroded down into a valley, especially if the rock types at the core are more susceptible to erosion than those in the surrounding areas.

In a Region That Has Been Deformed into a Series