A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
An earthquake on Dec. 16, 1811 caused parts of the Mississippi River to flow backwards.
243
The Caspian Sea is also classed as the world's largest lake.
52
The Sahara desert expands at about 1km per month.
90
Europe is the only continent without a desert.
62
The 'King Ranch' in Texas is bigger than the state of Rhode Island.
49