Zakhiwa kanjani iZimpophoma ZaseNiagara?
Ososayensi bakholelwa ukuthi ekuqaleni i-glacier yakha lezi ziphethu ngasekupheleni kweNkathi Yeqhwa eminyakeni engaba ngu - 13 000 edlule lapho amathani eqhwa ancibilika futhi encibilika ngokuhamba kwesikhathi. Ukuguguleka komhlaba kwabangela ukuba umfula wehle njengegquma, futhi umfula waqhubeka ugeleza phezu kwalokho manje okwaziwa ngokuthi i-Niagara Falls. Le nqubo ehamba kancane isenzeka nanamuhla lapho amanzi eba yiqhwa futhi encibilika, eqothula amatshe angaphansi komfula, okwenza ukuba izimpophoma zenyukele phezulu.