Conceptual computer artwork of the total volume of water on Earth (left) and of air in the Earth's atmosphere (right) shown as spheres (blue and pink), shown on the same scale as the Earth.
Left: All the water in the world including sea water, ice, lakes, rivers, ground water, clouds, etc. This sphere measures 1390 kilometres across and has a volume of 1.4 billion cubic kilometres. This includes all the water in the oceans, seas, ice caps, lakes and rivers as well as ground water, and that in the atmosphere.
Right: All the air in the atmosphere gathered into a ball at sea-level density. This sphere measures 1999 kilometres across and weighs 5140 trillion tonnes. As the atmosphere extends from Earth it becomes less dense. Half of the air lies within the first 5 kilometres of the atmosphere.
The spheres show how finite water and air supplies are.
Friday, January 30, 2009
Posted by Natan Slifkin at 8:48 AM