A Volcanic Eruption

As part of the Year 8 Earth science topic they have been studying types and formation of rocks. Most recently they have been they have been learning how volcanoes form igneous rock whose crystal size is determined by the rate of cooling.  When lava cools quickly igneous rocks have small crystals, if it cools underground it has larger crystals. To make this “come to life” for the pupils they had a go at making their own volcano erupt.