The Sahara Desert is expanding southward at a rate of about 48 kilometers per year due to desertification.

The Sahara is the largest hot desert on Earth.

The Great Lakes were formed by glacial movement.

Iceland is home to more than 100 volcanoes and experiences an earthquake almost every day.

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

The Pacific Ocean borders more countries than any other ocean.

Petra in Jordan was carved into rose-colored rock cliffs.

The Earth's crust is divided into tectonic plates.

The Himalayas continue to rise due to tectonic movement.