The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
62
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The Atlantic Ocean is saltier than the Pacific Ocean.
54
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Europe is the only continent without a desert.
62