2. Current (2007) estimates are that in the three pits containing the Terracotta Army there were more than 8,000 soldiers, 130 chariots with 520 horses, and 150 cavalry horses, the majority of which are still buried in the pits nearby Qin Shi Huang's mausoleum. The thousands of clay soldiers that have come to be known as the Terra Cotta
Army were created during the reign of Shihuangdi, the founder of China’s Qin
dynasty (221–207 BCE). Shihuangdi unified the Chinese empire, began construction
of the Great Wall of China and prepared for his own death by constructing a
20-square-mile (50-square-km) funerary compound, the treasures of which began to
come to light only some 2,100 years after his death.
3. I don't think this element relates to any other civilization.