There have been five mass extinction events in Earth's history — and we may be in the sixth.

The Nile River flows northward into the Mediterranean Sea.

Fact #30 · Geography

The longest mountain range in the world is the Andes.

Fact #917 · Geography

Australia is wider than the Moon — the continent spans about 4,000 km coast to coast.

Fact #4277 · Geography

Greenland is the world's largest island — Australia is considered a continent.

Fact #3402 · Geography

The Pacific Ring of Fire contains many of the world's active volcanoes.

Fact #100 · Geography

The Nile River delta is fertile farmland.

Fact #290 · Geography

Around 90% of the world's population lives in the Northern Hemisphere.

Fact #2769 · Geography

The Colosseum in Rome could hold up to 80,000 spectators — comparable to a modern NFL stadium.

Fact #3710 · Geography