'The balloon goes up at Krakatoa' is our new ELI activity. You require a tank and a balloon to simulate the huge tsunamis caused by the eruption of Krakatoa in 1883. While the eruption itself was awesome, it was the tsunamis that caused all the deaths, so how
were these tsunamis formed? Nobody really knows the exact mechanism, since no-one was there at the time. One theory is that, after the caldera had been formed, a side of the volcano slumped into the sea, causing the tsunamis. A second theory is that, when the magma chamber collapsed, huge volumes of sea water poured into the space and then slopped out again, causing the tsunamis. If this last theory is correct, you can recreate your own Krakatoan tsunamis using this ELI.
There are many free-to-download activities about volcanic eruptions and tsunamis on our website. To find them you can either 'Search topics' or 'Search activities.'