General quiz about China 5

Intermediate quiz (quite tough) about the geography, history, traditions and language of China (5)
1. Why is the Yellow River so called?
named after color of Imperial robes
pollution with yellow dye
carries yellow mud
rivers were named after colors
pujin,  yellow river
The oldest and largest ironware cultural relics protection group in the world - Kai-Yuan Tang Large Iron Oxen, located 110 m-470 m outside the west gate of the Puzhou Ancient City 15 km in the west of Yonji City, Available under a Creative Commons License
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