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
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
Every year, Alaska has about 5,000 earthquakes.
31
The Amazon rainforest produces more than 20% the world's oxygen supply.
182
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
Due to gravitational effects, you weigh slightly less when the moon is directly overhead.
55
Australia's Great Barrier Reef is 1,250 miles long!
45
