The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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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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Forest fires move faster uphill than downhill.
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The 'King Ranch' in Texas is bigger than the state of Rhode Island.
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Australia's Great Barrier Reef is 1,250 miles long!
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The North Atlantic gets 2.5 centimetres (1in) wider every year.
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