The Caspian Sea is also classed as the world's largest lake.
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Australia's Great Barrier Reef is 1,250 miles long!
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The average ice berg weighs 20,000,000 tons!
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The Atlantic Ocean is saltier than the Pacific Ocean.
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In 1850, only 8% of the people in California were women.
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The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
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