The city of Houston, Texas is built on a swamp and is slowly sinking!
89
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
One cubic mile of seawater contains about 50 pounds of gold.
79
Australia's Great Barrier Reef is 1,250 miles long!
45
The average ice berg weighs 20,000,000 tons!
54
The Sahara desert expands at about 1km per month.
90
It's still possible to see the division between East and West Germany due to different light bulbs.
5