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
Desert farming that regions and countries have expanded their agriculture despite being in an arid climate. Humans have been practicing and refining agriculture for millennia. Many of the earliest civilizations such as ancient Assyria, Israel/Judah, Egypt, and the Indus River Valley Civilization were founded in irrigated regions surrounded by desert. As these civilizations grew, the ability to rear crops in the desert became of increasing importance. There are also instances of civilizations that subsisted primarily in the desert with little irrigation or rainfall, such as various western American Indian tribes. The Native Americans practicing this agriculture included the ancient and no longer