Sudan copper, gold, granite, gypsum, iron, kaolin, lead, manganese, mica, natural gas, nickel, petroleum, silver, tin, uranium and zinc. The amount of rainfall increases towards the south. The central and the northern part have extremely dry desert areas such as the Nubian Desert to the northeast and the Bayuda Desert to the east; in the south there are swamps and rainforest. Sudan's rainy season lasts for about three months (July to September) in the north, and up to six months (June to November) in the south. The dry regions are plagued by sandstorms, known as haboob, which can completely block out
Operation Eagle Claw as a cracked rotor blade. Its crew was picked up by "Bluebeard 8". The remaining helicopters ran into an unexpected weather phenomenon known as a "haboob" (an enormous, nearly opaque cloud of fine dust particles that can follow a thunderstorm). "Bluebeard 5" flew into the haboob, but abandoned the mission and returned to the "Nimitz" when erratic flight instrumentation made flying without visual reference points impossible. The scattered formation reached Desert One, 50 to 90 minutes behind schedule. "Bluebeard 2" arrived last at Desert One at 01:00 with a malfunctioning second-stage hydraulic system, leaving one hydraulic system to control the