The Sahara desert expands at about 1km per month.
90
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
Check your map! Virginia extends farther west than West Virginia.
67
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Mexico City is built on top of an underground resevoir!
47
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243