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 Sahara desert expands at about 1km per month.
90
Longest officially recognized place name is Taumatawhakatangihangakoauauotamateapokaiwhenuakitanatahu.
112
10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
There are more than 50,000 earthquakes throughout the world every year!
47
Forest fires move faster uphill than downhill.
52
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138