What is the largest coral reef system on Earth, stretching along the northeast coast of Australia?

At a reception in Moscow in 1956, which Soviet leader told Western ambassadors, "We will bury you"? In 1975, which Saudi king was assassinated by his nephew at the royal palace in Riyadh? Reggie Miller spent his entire 18-season NBA career with which team? In a 1947 speech at Harvard, which U.S. secretary of state laid out his namesake plan for Europe's economic recovery? Morocco's Mount Toubkal, at about 13,700 feet, is the highest peak of which mountain chain? At about 1,700 square miles, which Utah lake is one of the largest in the world with no outlet? Orbiting at about 17,500 mph, which winged NASA spacecraft flew 135 missions between 1981 and 2011? Which is the longest African river that empties into the Indian Ocean?