The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The water of the Antarctica is so cold that nothing can rot there.
334
Forest fires move faster uphill than downhill.
52
The state with the longest coastline in the Continental U.S. is Michigan.
31
Even Antarctica has an area code. It's 672.
58
Australia's Great Barrier Reef is 1,250 miles long!
45