The two correct answers that indicate different rocks in the same area might weather differently are:
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rock pillars in the middle of grassy plains - This suggests that the exposure to different environmental factors (like vegetation and moisture) can affect the weathering of the rocks differently compared to other areas.
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cliffs with ridges - The presence of cliffs and ridges implies various orientations and exposures to weathering elements like wind, rain, and temperature changes, which can lead to differential weathering of the rocks.
So the answers you should select are rock pillars in the middle of grassy plains and cliffs with ridges.