The Amazon rainforest produces more than 20% the world's oxygen supply.
182
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
The Sahara desert expands at about 1km per month.
90
The Caspian Sea is also classed as the world's largest lake.
52
One cubic mile of seawater contains about 50 pounds of gold.
79