Izinto zokusika zepulasitiki zendabuko, ezivame ukusetshenziselwa ukudla okungavamile kanye nemibuthano, zinomthelela omubi endaweni ezungezile. Yenziwe nge-petroleum, insiza engavuseleleki, futhi kuthatha amakhulu eminyaka ukubola ezindaweni zokulahla imfucumfucu, okunomthelela ekungcoleni kwepulasitiki.