The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
The average ice berg weighs 20,000,000 tons!
54
In 1850, only 8% of the people in California were women.
0
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
The state of Florida is bigger than England!
74