Which term refers to early civilizations forming around river basins, known for agricultural surplus and centralized management?

• A. River Valley Civilizations
• B. Rule
• C. Scale
• D. Senate

Answer: (A)

The main idea is how geography—specifically fertile river basins—shapes early complex societies. Rivers provide dependable water for irrigation, and their seasonal floods leave behind fertile soil, allowing communities to produce more food than they immediately need. That agricultural surplus lets people specialize in other crafts and activities, and it calls for coordinated, centralized management to organize farming, storage, and public projects. The term that captures civilizations formed around these river landscapes, with surplus and centralized authority, is river valley civilizations. Think of early societies along the Tigris and Euphrates, the Nile, the Indus, and the Huang He—their location near rivers and their ability to support centralized structures define this idea.