One cubic mile of seawater contains about 50 pounds of gold.
79
Every year, Alaska has about 5,000 earthquakes.
31
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 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
Check your map! The Pacific entrance of the Panama Canal is farther East than the Atlantic entrance.
40
The city of Houston, Texas is built on a swamp and is slowly sinking!
89