Ukwanda koShishino kunye nokwanda kwabemi kumashumi ambalwa eminyaka adlulileyo kube negalelo elikhulu ekuthotyweni komgangatho wamanzi. Ezinye iigesi eziphuma kumaziko okucocwa kwamanzi zinetyhefu kwaye ziyatsha, ekufuneka zichongwe, njengehydrogen sulphide, ikharbon diokside, imethane, kunye ne...
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