As a biologist, I’m used to the idea that elements combine to form simple and complex molecules in an orderly way, and with a ‘purpose’. How different it must appear to the geologist, who studies the rocks that make up our planet.  While the basic tools that form these objects – matter and energy – are the same, the scale is massive, the forces and timescale barely imaginable, and here there is no guiding template, no enzymes to channel the way molecules combine, just a relentless chain of events.