The morphology of rocks is continuously transformed by the action of water, wind, chemical reactions, mechanical forces and bio-activity. Weathering and erosion carve out exquisite patterns, while chemical and biological processes drive pattern formation via accretion and break down. At large scales, these processes are studied by geomorphologists and at the smallest scales, by material scientists. Geological pattern formation at intermediate scales has received far less attention, although it is primarily at these scales that we observe rocks. Our imaging techniques have a curious gap in the range of scales. At micrometre scale, we have microscopes and at larger scales,...

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