Every year, Alaska has about 5,000 earthquakes.
31
The longest cave in the world is the 'Mammoth Cave System' in the USA at 560,000 mtrs deep!
63
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
Every person in the world can fit in Texas and be given over 1000 sq ft in which to live.
14
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
The water between India and Sri Lanka is only 3-30 feet deep and was purportedly passable on foot until 1480 AD when a cyclone moved some sand around.
1
One cubic mile of seawater contains about 50 pounds of gold.
79
The Atlantic Ocean is saltier than the Pacific Ocean.
54