This study guide provides an overview of topics to review for the Unit 2 exam. It lists characteristics of classical civilizations and empires. Key areas about Rome are outlined, including its geography, law, and transition from kingdom to republic. Greece is discussed in terms of Athens, democracy, city-states, and philosophers. Buddhism, Hinduism, Chinese dynasties, the Silk Road, and cultural diffusion from 200 BC to 1450 AD are briefly introduced. The student is directed to use this guide to research topics further and ask questions if needed.