The typical evolutionary explanation is that a creek slowly forms a canyon over vast ages. In this case we know that the canyons were formed quickly; then a stream began to run through them.
Ghuba limeelekea kupitia kila bonde. Maelezo asili kimageuzi ni kwamba ghuba husababisha bonde pole pole kwa muda mrefu. Katika kisa hiki tunajua mabonde yalifanyika kwa haraka; kisha mito ikapitia katikati.