The image shows a close up of a rock with a ruler on it, and the rock is covered in a thick layer of lichen.
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The image shows a close up of a rock with a ruler on it, and the rock is covered in a thick layer of lichen. The lichen is a vibrant green color, and it is spread across the rock in a uniform pattern. The ruler is placed in the center of the rock, indicating that the lichen has been measured.