The Sahara desert expands at about 1km per month.
90
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Every year, Alaska has about 5,000 earthquakes.
31
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
One cubic mile of seawater contains about 50 pounds of gold.
79
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25
There are more than 50,000 earthquakes throughout the world every year!
47