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Krakatoa's explosion was probably due to shifts in the crust of the earth below the site that resulted in the upwelling of a large quantity of magma. Additionally, faulting and subsiding may have permitted seawater to enter magma chambers. This would have cooled and solidified magma, thus "capping" the chamber(s) and allowing pressure to build to the point the island exploded to release the pressure.

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15y ago

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