One cubic mile of seawater contains about 50 pounds of gold.
79
Mexico City is built on top of an underground resevoir!
47
The Caspian Sea is also classed as the world's largest lake.
52
Australia's Great Barrier Reef is 1,250 miles long!
45
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The average ice berg weighs 20,000,000 tons!
54