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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More than 25% of the world's forests are in Siberia.
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A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
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In 1850, only 8% of the people in California were women.
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The Caspian Sea is also classed as the world's largest lake.
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One cubic mile of seawater contains about 50 pounds of gold.
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