Problem: Who was World Chess Champion immediately prior to Bobby Fischer?
Answer: boris spassky

Problem: Called the 'Escaut' in France, which 270 mile-long river rises in the north of that country, flows across Belgium, and empties into the North Sea in Holland?
Answer: schelde

Problem: Of which African country is Maseru the capital?
Answer: lesotho

Problem: A caldera is a feature of which natural structure?
Answer:
volcano