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Updated: July 13, 2025
On Etna there is lava over ice. The lecturer finally reviewed the volcanicity of our own neighbourhood. He described various vents of Erebus, thinks Castle Rock a 'plug' here some discussion Observation Hill part of old volcano, nothing in common with Crater Hill. Inaccessible Island seems to have no connection with Erebus.
Finally we had a few words on the origin of volcanicity and afterwards some discussion on an old point the relation to the sea. Why are volcanoes close to sea? Debenham thinks not cause and effect, but two effects resulting from same cause. Great argument as to whether effect of barometric changes on Erebus vapour can be observed.
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