The Sahara desert expands at about 1km per month.
90
Mexico City is built on top of an underground resevoir!
47
The water of the Antarctica is so cold that nothing can rot there.
334
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
Australia's Great Barrier Reef is 1,250 miles long!
45
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61