The Sahara desert expands at about 1km per month.
90
The average ice berg weighs 20,000,000 tons!
54
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
Every year, Alaska has about 5,000 earthquakes.
31
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
More than 25% of the world's forests are in Siberia.
51
There are more than 50,000 earthquakes throughout the world every year!
47