<prompt> Qedela umusho olandelayo: Ama-skimmer kawoyela asetshenziswa ngempumelelo ukusiza ekulungisweni kwe-Exxon Valdez  <response>: ukuchitheka ngo-1989. Ama-skimmers kawoyela ahlukile kuma-skimmers okuhlanza amachibi okubhukuda aklanyelwe inhloso efanayo kodwa ehlobene. 