The Sahara desert expands at about 1km per month.
90
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
Australia's Great Barrier Reef is 1,250 miles long!
45
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
There are more than 50,000 earthquakes throughout the world every year!
47