There are lakes beneath Antarctica’s ice.

Antarctica is technically a desert because it receives very little precipitation.

There are deep ocean trenches deeper than Mount Everest is tall.

Mongolia is the world's least densely populated country, with about 5 people per square mile.

The Sahara Desert contains vast rocky plateaus as well as sand dunes.

The entire population of Earth in 1 AD was around 300 million — roughly equal to the current population of the United States.

The largest island in the world is Greenland.

There are more than 17,000 islands in Indonesia — making it the world's largest archipelago country.

The Age of Exploration connected continents through sea travel.