Han Dynasty {Ans: Existed around 1950 years ago in Chinese history, representing a significant period.}Civilization criteria {Ans: Met by _______ due to organized society, surplus food, record keeping, large population, and construction of great monuments.}Silk Road {Ans: Enabled trade and cultural exchange between civilizations, but also spread diseases and sometimes led to conflicts.}Warm and waterproof clothing {Ans: Needed in November-December in a civilization with cold and wet climate, as described in the climagraph.}Irrigation {Ans: Significant achievement for ancient Sumerians, allowing crop growth in dry areas, leading to surplus food and civilization growth.}Ancient Egyptian attitude toward death {Ans: Influenced daily life with belief in afterlife, leading to elaborate tombs, mummification, and religious practices.}