Many people already know the answer to this, but pretend you don't, and if you have never known the answer consider yourself lucky it's a good puzzle. How does a stone form, I mean how does it by simple degrees and pressure and time go from a lump of mud to a hard conglomerate of rock or solid stone? Could temperature alone form a rock or pressure alone or does it take both motion and pressure? What exactly is pressure doing over such great lengths of time that give this result of something so difficult to break apart? Why does it take so long anyway? Can stones be formed out of any matter with time, heat, and pressure? How do all the atoms know to cling more tightly to each other when in rock form, I mean could one atom on one side of the rock have any sort of bond or intimate relationship with another atom on the other side of the rock?