There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
In one day, a full grown redwood tree expels more than 2 tons of water through its leaves.
56
The state with the longest coastline in the Continental U.S. is Michigan.
31
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
Forest fires move faster uphill than downhill.
52
Every year, Alaska has about 5,000 earthquakes.
31