Pinna süvendiks ehk pealispinnast madalamateks elementideks võivad olla järgmised pinna geomeetrilised kujundid, nagu nt soon, kriimustus, pragu, poor, õhuauk, kokkutõmbumisauk, lõhe, pilu, nõgus poolkuu, mõlk.
A surface recession can have the following geometric shapes, such as groove, scratch, crack, pore, blowhole, shrinkage hole, fissure, chink, crevice, wane, concave buckle, dent.
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