Social science

1. What was the main cause of World War I?

2. Which river is the longest in the world?

3. Which ancient civilization is known for its pyramids?

4. What is the capital of Japan?

5. Which continent is known as the 'Dark Continent'?

6. What is the primary language spoken in Brazil?

7. Which event marked the beginning of the American Revolution?

8. Which country is home to the Great Barrier Reef?

9. Who was the first President of the United States?

10. Which ocean is the largest on Earth?