"Its general appearance can best be expressed as being like an umbrella pine, for it rose to a great height on a sort of trunk and then split off into two branches, I imagine because it was thrust upward by the first blast and then left unsupported as the pressure subsided, or else it was borne down by its own weight so that it spread out and gradually dispersed. Sometimes it looked white, sometimes blotched and dirty, according to the amount of soil and ashes it carried with it." - Pliny the Younger description of eruption cloud (famous 79 A.D. eruption of Vesuvius which destroyed Pompeii).
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