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Philosophers attribute the sounds to suppressed volcanic action probably to the bubbling of gas or vapours underground. Extinct Volcanoes Auvergne Vienne Agde Eyfel Italy Lacus Cimini Grotto del Cane Guevo Upas Talaga Bodas The Dead Sea.
Of these, the Lakes of Vico and Agnano are the most interesting. The former is the ancient Lacus Cimini, and old authors state that its site was once occupied by a town, whose ruins used to be visible at the bottom of the lake when the water was clear. The ground, with the town upon it, is said to have been ingulfed during a volcanic convulsion, when the lake was formed in its place.
The town of Viterbo is built up at the foot of a steep hill called Monte Cimini, the lower part of which is composed of trachyte; this is surmounted by tuff, which appears to have been ejected from an extinct crater occupying the summit of the mountain, and now converted into a lake called the Lake of Vico.
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