Nkeihe mkpuchi osisi bụ nke pụrụ iche inogide na-abụghị kpara akwa. N'ihi ihe pụrụ iche, ọ nwere ike igbochi ịkwa akwa karịa ihe nkịtị. Ntu oyi na-ekpuchi maka osisi nwere ike chebe osisi gị pụọ na ntu oyi, snow, ifufe, uzuzu na ụzarị ultraviolet, ma mee ka osisi gị tolite ahụike. A na-ejikarị ịgbatị oge na-eto eto na mmiri na ụbịa.