Rangarira ndima iri pasi apa uye ipapo pindura mubvunzo gare gare mumutauro mumwe chetewo sechikamu:  Nzvimbo yavanofamba: Mhuka iyi inonyanya kugara pedyo nenzizi nemipata miduku. Dzinoda mvura ine tembiricha yakaderera uye inoyerera zvine mwero kana kuti inokurumidza. Mvura yacho haifaniri kuva nezvokudya zvakawanda (eutrophic). Muchikamu chayo chokumusoro, chakadai seNorway neFinland, inowanikwawo pedyo nenzizi dzakakura kana kuti kunyange hova huru. Mvura yacho inowanzova pedyo nemasango.  Mubvunzo: Chii chatingatarisira pedyo nesango?
mvura