For a volcanic eruption to occur, magma must make its way up to the surface, which implies there must be conduits through the rock below. Usually these conduits aren’t exposed. They’re either covered by the erupted lava, or, if erosion has removed the lava, are so small relative to the size of the erupted material that they’re likely to have been eroded away too. In any case, they are easily missed. But not far from Mono Lake, there is an unusual case where the “pipe” that fed an eruption at…
