More than 25% of the world's forests are in Siberia.
51
The Sahara desert expands at about 1km per month.
90
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
One cubic mile of seawater contains about 50 pounds of gold.
79
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
There are more than 50,000 earthquakes throughout the world every year!
47