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These volcanoes have lava with high levels of water. This water flash vaporizes as the lava approaches the surface, producing steam explosions violently ejecting ash, cinders, and bombs from the cone.

These volcanoes usually form inland of subduction zones, where water saturated sediments on the oceanic crust pass under continental crust. Friction between the layers melts the water saturated material and pressure forces it upwards.

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8y ago

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