Krakatoa is a volcano island located in the Sunda Strait, and is apart of the Indonesian Island Arc. It is also on the Ring of Fire and sits between two islands, Java and Sumatra. Krakatoa’s 1883 eruption is known as one of the most deadly eruptions in history. This powerful and explosive eruption follows many of the same general events of a volcanic eruption. The start of this eruption happened deep inside the earth’s core. As I explained the inner core and outer core are extremely hot and cause convection currents in the mantle. These convection currents cause the tectonic plates to move. Plate movements can lead on to subduction. Krakatoa was created by the Oceanic Indo-Australian plate subducting under the Eurasian plate. When the Indo-Australian plate subducted under the Eurasian plate, the friction of the two plates against each other led to heat, which led to the molten rock and crust to melt. …show more content…
The pressure of the magma continued to build up, but on Krakatoa this pressure built up for an unusually very long time before erupting. This long pressure build up was thought to be caused by the initial rumblings that had been going on for weeks before, the volcano had been letting out ash and debris out the main and secondary vents. This ash and debris may have blocked the vent until the pressure was able to over come it . Another reason the pressure build up was very large was due to high viscosity and thickness of the lava, the lava could not flow out easily and was stickier. The reason this lava was stickier, thicker and had a higher viscosity was due to the subduction that had caused the crust to melt, magma mixed with crust usually has this