Children spawn in the middle of a town overlooked by two volcanoes. Give them time to explore and settle in (possibly supplying them with some home-comforts, such as beds) before you gradually trigger two eruptions and a devastating earthquake by pressing the buttons located at the teleport locations.Very few of the houses should remain intact, partly due to channels below them through which lava will flow, and well placed trees to spread flames. You could use a flint & steel to start additional fires if you feel the need. If you do this whilst in 'spectator mode' you won't be seen doing it!
Children will then need to work together to mitigate the damage. You may want to save the world before triggering the events to give children a second chance and opportunity to make preparations ahead of time. In the aftermath, children could discuss what survival 'aid' items they would like to be 'airdropped' to the outskirts of the town, in the form of a chest.
Follow-up work could involve researching how this experience was similar / different to a real eruption.