A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
Check your map! Virginia extends farther west than West Virginia.
67
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
One cubic mile of seawater contains about 50 pounds of gold.
79
The Sahara desert expands at about 1km per month.
90
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The Amazon rainforest produces more than 20% the world's oxygen supply.
182