What is associated with: as early as 3000 bc this gemstone was known in china as yu or the royal gem?

What is associated with: as dutch leader in 1672 william cut these structures around amsterdam to flood the land foil t… Based on the clue 'as earl of this james brudenell had a sweater name...', what is the answer? What is associated with: as early as 1727 johann schulze discovered the light sensitivity of salts of this element but… What is associated with: as early as 1867 this nyc store with a red star symbol was open until midnight christmas eve? Based on the clue 'as early as 600 ad monks recorded these on england...', what is the answer? What is associated with: as early as the 1730s cuckoo clocks were made in this woodsy region of southwest germany? Based on the clue 'as early as the 8th century the english were requi...', what is the answer? Based on the clue 'as earth wobbles slowly on its axis this moves in ...', what is the answer?