Antarctica is the largest desert on Earth, covering about 5.5 million square miles. It is classified as a desert because it receives very little precipitation, mostly in the form of snow.

Tap to flip back

Vatican City is the smallest country in the world, covering only about 0.17 square miles (0.44 square kilometers). It is an independent city-state located entirely within Rome, Italy.

Tap to flip back

The Nile River in Africa is the longest river in the world, stretching approximately 4,130 miles (6,650 kilometers) from its source to the Mediterranean Sea.

Tap to flip back

We have time zones because the Earth rotates, causing the sun to be at different positions in the sky at the same moment in different locations. Time zones divide the world into regions so each area can set its clocks based on the sun's position in that location.

Tap to flip back

Russia is the largest country in the world by area, covering about 17.1 million square kilometers. It spans across Eastern Europe and northern Asia.

Tap to flip back