The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The state with the longest coastline in the Continental U.S. is Michigan.
31
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Even Antarctica has an area code. It's 672.
58
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63