What numerical name is given to the North and South Atlantic, North and South Pacific, Arctic, Antarctic and Indian Oceans together?

Nora Ephron was a prominent blogger for which political website co-founded by Arianna in 2005? Mars's Olympus Mons, higher than Everest and about as big as Arizona, is what kind of landform? Now meaning someone hostile to culture and the arts, which word named a people subdued by King David? Which began 11 days after the Treasury Department was established in 1789, and has since grown to trillions of dollars? Which New York ballpark, opened in 1923, was known as "The House That Ruth Built"? Which of Disney's Seven Dwarfs has a name that can be spelled using only letters in the word "JEOPARDY"? Which royal and his wife Diana divorced in 1996? Which of these is one of the six official languages of the United Nations?