The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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There's a lake under Antarctica that is 25 million years old called Lake Vostok.
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The Amazon rainforest produces more than 20% the world's oxygen supply.
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Israel's Dead Sea is 1,312 feet below sea level.
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The Dallas/Ft. Worth airport is larger than New York City's Manhattan Island.
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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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The water of the Antarctica is so cold that nothing can rot there.
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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.
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