Mount Etna in Sicily is Europe's most active volcano and has been erupting continuously for at least 2,700 years.

There is more water in Earth's mantle than in all the oceans on the surface.

Water covers more than 70% of Earth's surface.

Mount Everest is not the closest point to space — that title goes to Mount Chimborazo in Ecuador due to Earth's equatorial bulge.

The Silk Road connected Asia and Europe for centuries.

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

The Atacama Desert in Chile is so dry that some weather stations there have never recorded rain.

The Trans-Siberian Railway is one of the longest railway lines in the world.

The Earth's mantle lies between the crust and core.