Gudun ruwa

Corrasion kalma ce ta geomorphological don aiwatar da rushewar inji na farfajiyar duniya wanda ya haifar lokacin da ake jigilar kayan a fadin ta hanyar ruwa mai gudana, raƙuman ruwa, kankara, iska ko motsi mai nauyi.Whittow, John (1984). Dictionary of Physical Geography. London: Penguin, p. 119. . Misali shine lalacewar dutse a kan kogi ko zurfin teku ta hanyar tasiri ko aikin niƙa na barbashi da ke motsawa tare da ruwa. Sakamakon tasirin da aka samu a kan dutse ana kiransa Abrasion.
Rashin lalacewa ya bambanta da lalata wanda ya faru ne saboda aikin sinadarai da mai narkewa na ruwa a kan duwatsu masu narkewa ko kuma wasu lokuta masu narkewar lokacin da suka haɗu.

Corrasion yana aiki a hanyoyi biyu:

 Rashin lalacewa na gefe: rushewar gefe wanda ke fadada kogin. 
 Rashin lalacewa na tsaye: rushewa zuwa ƙasa wanda ke zurfafa kwarin kogi.

Don haka lalata wani nau'i ne na rushewa.

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