The Sahara desert expands at about 1km per month.
90
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
More than 25% of the world's forests are in Siberia.
51
The Caspian Sea is also classed as the world's largest lake.
52
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138