Solid crust of the lava flow

It is hard to imagine a more wild and gloomy picture than the one that presents us with the outer surface of the flow of blocky lava. Another peculiar form of the so-called wavy lava that is less common, but well known to every visitor to Mount Vesuvius. The road from the rubber to the observatory is laid at considerable length on this lava, the latter thrown Vesuvius in 1855, The Protection of these threads is not broken into pieces, and is a solid mass, irregular surface of which resembles a sort of his intestinal plexus.