Apparently they come in various sizes, and are not true volcanoes. At the same time they can be pretty big.
As we know, they could produce artificial earthquakes since God knows when...
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18th & 19th centuries: artificial Earthquakes, Volcanoes and Tsunamis | Patents and Inventions | 4 | |
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Lost Cause: United Daughters of Confederacy | Bizarre | 0 |