One cubic mile of seawater contains about 50 pounds of gold.
79
The state with the longest coastline in the Continental U.S. is Michigan.
31
The Caspian Sea is also classed as the world's largest lake.
52
Australia's Great Barrier Reef is 1,250 miles long!
45
Europe is the only continent without a desert.
62
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The city of Houston, Texas is built on a swamp and is slowly sinking!
89