Which Middle Eastern language became the sixth official language of the UN General Assembly in 1973?

What is a woman with literary or intellectual interests sometimes called? A lake of what, not water, sometimes fills Hawaii's Kilauea volcano? A lake on the New York-Vermont border is named for which explorer who visited the region in 1609? Which word means both a football score and a landing made by an aircraft or spacecraft? Complete the Lao Tzu line: "A journey of a thousand miles begins with..." A larch is what kind of plant? A large armada crossed the English Channel to invade the beaches of which region on June 6, 1944? A large bay bearing its name borders which capital city, settled by the Spanish in 1571?