The document provides an overview of early civilizations. It discusses how the development of agriculture led humans to settle in river valleys where they had fertile land and water, establishing traditional economies. Two of the earliest civilizations were Çatalhöyük and Göbekli Tepe, located in modern-day Turkey. Çatalhöyük was a large Neolithic settlement composed of domestic buildings with a population of around 8,000. With agriculture producing a surplus, societies were able to develop more complex social structures, organized governments, specialized jobs, and culture.