Ulwandlekazi
Ulwandlekazi yindikimba yamanzi anetswayi ehlanganisa cishe amaphesenti angama-70.8% woMhlaba. Ulwandle luhlukaniswe lwaba izindikimba zamanzi ezinkulu, ezibuye zibizwe ngokuthi izilwandlekazi ( iPacific, i-Atlantic, i-Indian, i- Antarctic/ iNingizimu, ne- Arctic Ocean ) , futhi zona ngokwazo zihlukene kakhulu zab ulwandle, gulfs kanye nezindikimba zamanzi ezilandelayo . Ulwandle luqukethe amaphesenti angama-97% wamanzi oMhlaba [1] futhi luyisigcoyi esiyinhloko se- hydrosphere Yomhlaba, lusebenza njengenqolobane yokushisa egcina isidlakalasi somhlaba , kanye nomjikelezo wawo womCalahle nomjikelezo wamanzi, okwakha isisekelo sezulu nesimo sezulu emhlabeni jikelele. Ulwandle lubalulekile kwimpilo eseMhlabeni, luphethe izilwane eziningi zomhlaba kanye nempilo ye -ngunaza, [2] okuyimvelaphi yomdibakhanya futhi ngalokho-ke isOhwe somoyambulunga woMhlaba, sihlinzeka ingxenye yawo.