If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The average ice berg weighs 20,000,000 tons!
54
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Forest fires move faster uphill than downhill.
52
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181