Which mineral of silicon dioxide keeps time in many watches because it vibrates at a precise frequency when electricity is applied?

The year 2010 saw the 40th anniversary of which environmental observance? Count Dooku, played by Christopher Lee in the "Star Wars" prequels, took which Sith name? Ray Mercer, Ray Seales and which other "Ray" won Olympic boxing gold medals for the U.S.? Four lighthouses have been built on the Eddystone Rocks off Plymouth, England, which were long notorious for causing wh… In the 9th century, Viking invaders set up the Danelaw, an area of which country in which Danish law was supreme? A believer in Gandhian nonviolence, pacifist A.J. Muste helped found which civil rights group in 1942? Which word for a bishop's tall headdress also names a corner joint where two pieces meet at 45-degree angles? During the American Revolution, colonists who stayed loyal to the British crown were known as Loyalists or what?