sentences:  As the area of cultivation expanded, so too has the diversity, as Aouderas's existence as a servile date plantation for Tuareg caravans has declined.While the early history of the Aïr Massif is speculative, the area has been populated since at least 10,000 years ago, when the surrounding deserts were lush grasslands.When the Tuareg tribes were pushed south by Arab invaders in the eighth and ninth centuries CE, there were Gobirwa Hausa in the southern Aïr.