Kahoo, ho tlameha ho boleloa hore e petetso e etselitsoe le ho hlahisoa ka tsela e ka khonang ho sebetsana le likhatello tse susumetsang nakong ea lipalangoang tsa metsi kapa ka gaswations. Lipehelo tse ling (limela tsa matla, ho pheta-pheta lintho tsa petroleum, jj) li hloka mekhoa e melelele e telele le e rarahaneng. Ho feta moo, mefuta ena ea libaka e sebetsana le mathata ka lebaka la sebaka se lekanyelitsoeng sa ho sebetsa.