Which river's delta and annual floods sustained ancient Egyptian civilization through irrigation and transportation?

• A. Amazon River
• B. Mississippi
• C. Yangtze
• D. Nile River

Answer: (D)

The key idea is how a river’s regular floods and its network can support farming and movement. The Nile provided exactly that for ancient Egypt: each year its waters rose and spread across the floodplain, leaving behind nutrient-rich silt that made the soil fertile enough to plant crops with little rainfall. When the floodwaters receded, Egyptians could use irrigation systems and canals to distribute water to fields, producing a stable harvest that supported cities and a centralized state. The river also served as a natural highway, carrying boats from the south to the Mediterranean and back, which facilitated trade, communication, and administration across vast stretches of land. The Nile Delta, where these channels spread out before reaching the sea, offered a broad, productive heartland. Other rivers listed exist in different regions and did not sustain ancient Egyptian civilization in the same way, because their climates and historical contexts did not provide the same combination of dependable floods, fertile land, and easy transportation that the Nile did.