It's Free-for-All Friday as well as Earth Day, so today's mentalfloss.com Brain Game focuses on the little blue planet that most of us call home. Good luck!

What are the most populous cities (proper) in
each of the six most populated continents?

1. North America
2. South America
3. Europe
4. Asia
5. Africa
6. Australia

Here are the ANSWERS.

THE ANSWERS:

1. Mexico City, Mexico
2. São Paulo, Brazil
3. Istanbul, Turkey
4. Shanghai, China
5. Lagos, Nigeria
6. Sydney, Australia

Thanks for playing, and have a great weekend!