N'oge na mgbe ebuli ugwu elu, a na-eme ka ugwu dị iche iche na-emebi ihe (mmiri, ifufe, ice, na ike ndọda) nke na-eji nwayọọ nwayọọ na-eme ka ebe ahụ dị elu. Erosion na-eme ka elu ugwu dị obere karịa nkume ndị na-eme ka ugwu ahụ dị elu. Usoro glacial na-emepụta ọdịdị ala, dị ka pyramidal peaks, knife-edge arêtes, and bowl-shaped cirques that can contain lakes. Ugwu ugwu, dị ka Catskills, na-etolite site na nsị nke elu ugwu dị elu. Ajụjụ: Gịnị na-akpata erosion?
elu ugwu ga-abụ nwata karịa nkume ndị na-etolite ugwu onwe ha