The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
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There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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It takes a drop of ocean water more than 1,000 years to circulate around the world.
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
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The water of the Antarctica is so cold that nothing can rot there.
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The Amazon rainforest produces more than 20% the world's oxygen supply.
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