The two correct answers that indicate that different rocks in the same area might weather differently are:
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Cliffs with ridges - The presence of ridges can indicate different types of rock and varying weathering processes based on exposure to elements.
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Rock pillars in the middle of grassy plains - Rock pillars can suggest that the surrounding soil and vegetation may provide different conditions affecting weathering rates compared to exposed rock.
The other options, "a smooth plain" and "rock deep in a cavern," are less indicative of differences in weathering among rocks in the same area.