Natural Wonders Facts

The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!

The Niagara Falls moves upstream at an average rate of about 295ft a century!

Miners in Mexico found a hidden cave in 2000 with the largest crystals on Earth. The crystals were white gypsum beams up to 37 feet long and 3 feet wide. The heat inside hit 136 degrees with near-total humidity. Without a cooling suit, a person can die within about 10 minutes. In 2015, the mine flooded and sealed the cave shut.