What is associated with: a round tower opened in copenhagen in 1642 as an observatory has this name in english?

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 solid geometric figure or a field of knowl...', 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 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? Based on the clue 'a rounded mass of radicchio for example', what is the answer? Based on the clue 'a rouser may rouse this low class of people', what is the answer?