What is the biggest ocean in the world?
Which is the biggest desert in the world?
What is the biggest country in the world by area?
What is the biggest island in the world?
Which is the biggest waterfall in the world by height?
What is the biggest animal in the world?
Which is the biggest continent in the world by area?
What is the biggest river in the world by volume of water?
Which is the biggest lake in the world by area?
What is the biggest mountain range in the world?
Which is the biggest man-made structure in the world?
What is the biggest rainforest in the world?
What is the biggest planet in our solar system?
What is the smallest country in the world by area?
What is the smallest ocean in the world?
What is the smallest bird in the world?
What is the smallest continent in the world?
What is the smallest planet in our solar system?
What is the smallest country by population?
What is the smallest bone in the human body?