Extinct volcanos are bound to be disappointing. We expect to arrive at the scene of a catastrophe. We end up admiring picturesque hills. I guess Pompeii is an exception: a city buried under ash, destructive power of the explosion preserving ancient artifacts for our benefit. I was thinking of Pompeii when touring Wupatki and Sunset Crater Volcano National Monuments. When the volcano here erupted sometime before 1100, Anasazi civilization was still very much present in the area. I envisioned pueblo-style buildings preserved in ash, hoping for something spared from well meaning, but misguided, 20th century archeologists. But this is not Pompeii. Inhabitants of Wupatki pueblo were not doing so great before the eruption. Porous desert soil, unable to hold water, was lacking nutrients due to over-cultivation. Ash from the volcano acted as a fertilizer and improved water-holding capacity of their fields. Researchers found imprints of corn ears in lava flow. The working hypothesis is that they were offerings intended to stop the eruption. But maybe we underestimate our predecessors: what if they knew the volcano was actually beneficial and fed it corn to keep it going?