10 of the tributaries flowing into the Amazon river are as big as the Mississippi river.
41
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
Europe is the only continent without a desert.
62
The city of Houston, Texas is built on a swamp and is slowly sinking!
89
If Manhattan had the same population density as Alaska, there would only be 15 people living there.
138
The North Atlantic gets 2.5 centimetres (1in) wider every year.
119
A volcano has enough power to shoot ash as high as 50 km into the atmosphere.
59