YELLOW NILE RIVER

WHERE THE YELLOW NILE FLOWS It may well be that while the Bible's Northern Hemisphere was flooding, that the Southern Hemisphere was drying out, was desiccating. How else can one, may we, account for the large Sahara Desert becoming dry where vast wetlands once were? and where, as significantly, the Yellow Nile once flowed into Nubia to join the Blue and White Niles before all entered into Kemet?  http://www.geologypage.com/2013/04/nile-river.html?fbclid=IwAR0cq7HdP8NsVck5VHIIua9xvj12XEWLLChxQVyPqLVcX_x4G6vTWgUnyuI