David: What is the longest river in Europe?
Talia: The longest river in Europe? Uh… Is it the Danube?
David: No. Guess again.
Talia: I have no idea. Can you give me a hint?
David: It starts with a V.
Talia: It begins with a V? Oh, oh, the Volga!
David: That's right. The Volga is the longest river in Europe. It is over 3,200 kilometers long.
Eric: What is the biggest forest in South America?
Amy: Oh, come on! That's too easy.
Eric: Oh yeah?
Amy: Of course. Everybody knows it's the Amazon.
Eric: That's right. It's the Amazon rainforest. It's over 3.5 million square kilometers.
Grace: So, what is the smallest continent on earth?
James: Continent? It's not Europe. It's Australia.
Grace: That's right. Some people even consider it the largest island in the world.
James: Wait, isn't Greenland the largest island in the world?
Grace: Well, Greenland is only 2.2 million square kilometers. Australia is 7.7 million square kilometers.