It might just be a side-effect the particles forming the 'rim' being deposited when they were damper, and hence more 'sticky', than those forming the outer parts. These damper particles presumably came from deeper in the soil.
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It might just be a side-effect the particles forming the 'rim' being deposited when they were damper, and hence more 'sticky', than those forming the outer parts. These damper particles presumably came from deeper in the soil.
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