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
There are approximately three chickens for every human on Earth.
13
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Mexico City is built on top of an underground resevoir!
47
The Caspian Sea is also classed as the world's largest lake.
52
Even Antarctica has an area code. It's 672.
58
The city of Houston, Texas is built on a swamp and is slowly sinking!
89