The mineral argentite is an important ore of which metal?

Argentina mourned which former actress and first lady when she died of cancer in 1952? Argentina declared its independence from which country in 1816? Argentina's longest international border, running for thousands of miles along the Andes, is shared with which country? Argentina's new 1949 constitution allowed which sitting president to run for re-election? Aarhus, Denmark's second-largest city, lies on which part of the country? Ariana Richards and Joseph Mazzello played the young grandchildren in which 1993 dinosaur blockbuster? The spirit Ariel serves the magician Prospero in which Shakespeare play? Ariel, the heroine of a 1989 Disney animated film, is what kind of creature?