All The Water In The World. Seas, rivers, lakes, ground water, ice and clouds. (14,087 billion cubic kilometers) Gathered into a ball and compared to the size of the earth. All the Air In the Atmosphere. Gathered into a ball at sea-level density. (5,140 trillion tonnes). [The following commentary is NOT printed on this card.] Stand on the surface of the earth and look around. Seems like there is plenty of air and water on the planet. So much, we don't even need to think about it much. But from this perspective, we can see how these are very limited resources. Perhaps we need to think more carefully and take better care of these limited resources. Great example of how visual mapping and images can communicate beyond the simple use of facts and statistical information. These images communicate on a much deeper level. Published in England.