The state with the longest coastline in the Continental U.S. is Michigan.
31
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
The Atlantic Ocean is saltier than the Pacific Ocean.
54
The average ice berg weighs 20,000,000 tons!
54
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
More than 25% of the world's forests are in Siberia.
51