The Sahara desert expands at about 1km per month.
90
It takes a drop of ocean water more than 1,000 years to circulate around the world.
61
A waterfall known as The Devil's Kettle empties water into a hole and nobody knows where it ends up!
18
More than 25% of the world's forests are in Siberia.
51
There's a lake under Antarctica that is 25 million years old called Lake Vostok.
109
Every year, Alaska has about 5,000 earthquakes.
31
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59