Civilizations - Topics

What records survive from ancient civilizations? What happened to the Khmer Empire? What was the Silk Road and why did it matter? What makes a society a civilization? Why did the Roman Empire fall? How did the Ottoman Empire last so long? How did ancient civilizations track time? Why are ziggurats similar to pyramids? Why do civilizations rise in certain places? What was the Silk Road's cultural impact? Why was the Nile so vital to Egypt? How did ancient cities manage sanitation? How did the Greeks influence modern democracy? Why did the Byzantine Empire outlast Rome? What was the impact of the Mongol Empire? What caused the fall of the Maya civilization?