How big of a sphere would all the Earth’s water or air be? (from Science Photo Library, via ddmeyer’s delicious)
From the SPL site:
“Global Air & Water Volume: 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). The spheres show how finite water and air supplies are. The water sphere…includes all the water in the oceans, seas, ice caps, lakes and rivers as well as ground water, and that in the atmosphere. […] As the atmosphere extends from Earth it becomes less dense. Half of the air lies within the first 5 kilometres of the atmosphere.”
