The Amazon rainforest produces more than 20% the world's oxygen supply.
182
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The Sahara desert expands at about 1km per month.
90
Australia's Great Barrier Reef is 1,250 miles long!
45
In 1850, only 8% of the people in California were women.
0
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25