The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
If Antarctica's ice sheets melted, the worlds oceans would rise by 60 to 65 metres (200 - 210ft) - everywhere
181
In 1850, only 8% of the people in California were women.
0
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.
14
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Check your map! Virginia extends farther west than West Virginia.
67
More than a dozen men have stood on the surface of the moon, but only three have been to Challenger Deep in the Marianas Trench, the deepest known spot in the ocean.
17
It's still possible to see the division between East and West Germany due to different light bulbs.
5