What is the capital city of Saudi Arabia?

The Ozone Layer is found in which layer of the atmosphere?

What is the currency of China?

The Great Wall of China was primarily built to protect against invasions from which direction?

Which gas causes the greenhouse effect most significantly among human-made emissions?

Which city is known as the City of Gold?

The concept of 'zero' as a number was first developed in which ancient civilization?

What is the capital city of Australia?

The Olympic Games of 2024 were held in which city?

Which country is the third most populous in the world?

Which blood type is known as the universal donor?