10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
The Niagara Falls moves upstream at an average rate of about 295ft a century!
48
Mexico City is built on top of an underground resevoir!
47
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 average ice berg weighs 20,000,000 tons!
54
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
The warmest temperature ever recorded on Antarctica was 3 degrees F.
175
Connecticut and Rhode Island never ratified the 18th Amendment (Prohibition).
25