The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Even Antarctica has an area code. It's 672.
58
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
One cubic mile of seawater contains about 50 pounds of gold.
79
The state with the longest coastline in the Continental U.S. is Michigan.
31
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59