Which two-word Latin phrase means "voice of the people"?

What two-word name is given to 0 degrees longitude? Which two-word phrase naming a body part describes a craving for candy and sweets? Which two-word phrase describes the period of U.S. economic history from 1929 to 1939? Which eastern Canadian province has a two-word Latin name? What two-word name was used for the communist regime that brutally ruled Cambodia in the 1970s? What two-word nickname was given to Florida's electric chair, built by inmates in 1923? What two-word slang name refers to Australia, the smallest continent? Which giant relative of the dugong and manatee, found in the Bering Sea in 1741, was hunted to extinction by about 1768?