The Great Wall of China spans thousands of miles.

The Earth is about 4.5 billion years old.

New Zealand was the first country to give women the right to vote, in 1893.

The Sahara Desert stretches across northern Africa.

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

The Earth's crust is composed of tectonic plates.

The Silk Road connected Asia and Europe for centuries.

The Atacama Desert in Chile is the driest non-polar desert on Earth — some weather stations there have never recorded rain.

The Nile is generally considered the world's longest river, but some measurements put the Amazon ahead depending on source point.