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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Forest fires move faster uphill than downhill.
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Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
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The Sahara desert expands at about 1km per month.
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Forest growth in the US has exceeded harvest since the 1940’s. Today, we have more trees than any time in the past 100 years.
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