They are found on Easter Island, but what is a moai?

What is measured with the Richter scale?

How many people live in the EU?

What continent is the smallest?

What is the second smallest continent?

What continent is the second largest?

What continent is the world's largest?

How many percent of Earth's surface is land mass?

How many percent of Earth's surface is water?

The Sahara is the world's biggest warm desert. Where do you find it?

What is the world's biggest warm desert called?

How many continents are there?