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 - The exposure of rock pillars to different environmental conditions (like moisture and temperature) compared to the surrounding plains can lead to different weathering rates.
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Cliffs with ridges - The structure of cliffs with ridges can create variations in exposure to wind, rain, and sunlight, leading to differential weathering patterns.
The other options, "rock deep in a cavern" and "a smooth plain," do not indicate significant differences in weathering because they are typically more uniform environments.