A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
The Atlantic Ocean is saltier than the Pacific Ocean.
54
Australia's Great Barrier Reef is 1,250 miles long!
45
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
The city of Houston, Texas is built on a swamp and is slowly sinking!
89