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Volcanoes form when hot molten rock (magma) under the ground erupts at the surface, but what causes the molten rock to erupt? Eruptions are often driven by gases escaping…

In this experiment you can start a chemical reaction that creates a gas, and see how the gas escaping drives an eruption.

This experiment and video was devised by the Volcano Seismology group in the Earth Science Department, University of Cambridge.

Download the instructions and information sheet