Topic Details (Notes format)

Which element has the chemical symbol "Pr"?

Which river forms part of the border between Mexico and the United States?

Which explorer circumnavigated the world in his ship the Golden Hind, returning in 1580?

Which is the largest stadium in the world by seating capacity?

In which layer of Earth’s atmosphere do commercial airplanes typically fly?

Which empire used quipus (knotted cords) for record-keeping instead of a formal writing system?

In astronomy, which term describes the apparent path of the Sun across the sky over a year?

Which is the second-longest river in Africa after the Nile?

Which country was formerly called Ceylon until 1972?

Who discovered the structure of cytochrome c?