abrasion

noun

the wearing down of rock particles by friction due to water or wind or ice
水、風、あるいは氷による摩擦によって岩の粒子がすり減ること
erosion by friction
摩擦による浸食
an abraded area where the skin is torn or worn off
皮が引き裂かれる、または擦り切れてすりむいた部分

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