Arabia s alluvial fans grow and decay with Earth s orbital cycles phys.org - get the latest breaking news, showbiz & celebrity photos, sport news & rumours, viral videos and top stories from phys.org Daily Mail and Mail on Sunday newspapers.
The severe aridity on the Arabian Peninsula, in 6th century A.D., and the other, already known factors, contributed to the downfall of an ancient kingdom, leaving the region fractured and unstable.