![]() Water is less available due to climate change, pollution, or overuse. There is not enough fresh, clean water to meet local demand. This lifestyle often includes an occupation, ritual status in a hierarchy, and customary social interaction and exclusion based on cultural notions of purity and pollution. CasteĪ form of social stratification characterized by endogamy (hereditary transmission of a lifestyle). Hydraulic empireĪ social or governmental structure that maintains power through exclusive control of water access. ![]() A crescent-shaped region containing the comparatively moist and fertile land of otherwise arid and semi-arid Western Asia, and the Nile Valley and Nile Delta of northeast Africa. ![]()
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