A: It could be because the south-facing side gets intensely baked by the sun year round, leading to what could appear to be a "beige" tint, Stone Mountain Park officials told Q&A on the News in an e-mail. Even though the same amount of water would run off this area, the sun dries more of the moisture on that side. As a result, mosses and lichens would be able to grow better on the cooler, north-facing side, which has the carvings and appears to have the "greenish" tint.
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