>>80-81
Followings are hypotheses by the administrator of some site.
Large quantities of radioactive matters such as uranium are contained in various metals conveyed in the drainage crust inside the earth.
Such radioactive matters are concentrated on magma chambers, they meet with large quantities of waters at some critical level and so that, nuclear fissionable reactions are caused.
Consequently, an eruption as a great explosion occurs.
Namely, it's supposed that principles of eruption and energy-sources of eruption are originated in radioactive matters brought from the drainage crust to magma chambers.
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