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Joint Photographic Experts Group Image  |  2001-11-27  |  26.7 KB  |  350x337  |  16-bit (35,312 colors)
   ocr: Rain can cause the formation of "potholes" in granite. Carbon dioxide gas thati is dissolved in the rainwater reacts with feldspar in the granite. The result is clay, which washes away, and the granite slowly erodes.