A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
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
The Sahara desert expands at about 1km per month.
90
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The Caspian Sea is also classed as the world's largest lake.
52
Mexico City is built on top of an underground resevoir!
47