The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
One cubic mile of seawater contains about 50 pounds of gold.
79
The names of the continents all end with the same letter with which they start, excluding the North and South infront of AmericA.
86
In 1850, only 8% of the people in California were women.
0
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The Caspian Sea is also classed as the world's largest lake.
52
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109