The main argument against the sulfur not being god's rain on these cities is that it came from volcanoes.
A volcano is a crack in a planet's crust, such as the one on Earth, that permits hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Most volcanoes on Earth are found underwater, and they are most frequently found where tectonic plates are diverging or convergent.
A volcano will erupt sulfur dioxide (SO2) when the magma is quite close to the surface. A volcano that is not currently erupting may be about to erupt if SO2 is found there.
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