all the water in the world (or 1.4087 billion cubic kilometres of it) including sea water, ice, lakes, rivers, ground water, clouds, etc. (left). all the air in the atmosphere (or 5140 trillion tonnes of it) gathered into a ball at sea-level density (right). both shown on the same scale as the Earth.

all the water in the world - data visualization & visual design - information aesthetics [via @RobertP]