In 1850, only 8% of the people in California were women.
0
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Mexico City is built on top of an underground resevoir!
47
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The Atlantic Ocean is saltier than the Pacific Ocean.
54
The Sahara desert expands at about 1km per month.
90