The two correct answers indicating that different rocks in the same area might weather differently are:
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cliffs with ridges - This suggests variations in rock types or structures that could lead to different weathering rates.
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rock pillars in the middle of grassy plains - These monopolian structures indicate that some rocks are resisting weathering better than others in the surrounding area, possibly due to differences in composition or structure.
The other options, "rock deep in a cavern" and "a smooth plain," do not specifically indicate differences in weathering among rocks.