The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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Europe is the only continent without a desert.
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The Sahara desert expands at about 1km per month.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
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 Amazon rainforest produces more than 20% the world's oxygen supply.
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