Based on the clue 'a round solid geometric figure or a field of knowl...', what is the answer?

Based on the clue 'a roulette wheel has this many slots with odd numb...', what is the answer? Based on the clue 'a round container for margarine parkay has a talki...', what is the answer? Based on the clue 'a round missile of war or a splashy pool entry', what is the answer? Based on the clue 'a round of golf begins with one', what is the answer? Based on the clue 'a round stone ball is commonly used in this sport ...', what is the answer? What is associated with: a round tower opened in copenhagen in 1642 as an observatory has this name in english? What is associated with: a round type of this structure with the silo inside it was popular in the early 1900s its rare… Based on the clue 'a rounded mass of chewing gum', what is the answer?