The Sahara desert expands at about 1km per month.
90
Venice Island was built on a foundation of tree trunks. 1200 years later, those same trunks still support almost all of central Venice.
8
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The state of Florida is bigger than England!
74
The Amazon rainforest produces more than 20% the world's oxygen supply.
182