A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Mexico City is built on top of an underground resevoir!
47
In 1850, only 8% of the people in California were women.
0
Australia's Great Barrier Reef is 1,250 miles long!
45
The Sahara desert expands at about 1km per month.
90