The Sahara desert expands at about 1km per month.
90
In 1850, only 8% of the people in California were women.
0
Forest fires move faster uphill than downhill.
52
More than 25% of the world's forests are in Siberia.
51
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The state of Florida is bigger than England!
74