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The Most Dangerous Volcanoes on the Planet
The grand unifying theory of volcanoes is plate tectonics. So we've got three main tectonic environments where we get volcanoes. Iceland that you just mentioned is where two tectonic plates are moving apart. And so it drops the pressure on the Earth's mantle and melts it. That's why you've got loads of magma coming up there. But then the really probably most dangerous volcanoes on the planet are in subduction zones. They tend to because they're unpredictable or luxury eruptions.