Which is the longest river in the world?

Which is the most spoken language in the world?

Which animal is the national symbol of Australia?

Which is the coldest place on Earth?

Which continent is known as the "Dark Continent"?

Which ocean lies on the east coast of the United States?

Which is the tallest mountain in the world?

Which is the most widely practiced religion in the world?

Which is the longest highway in the world?

How many continents are there?