Bubble escape and drag race for schools

There are many different types of volcanoes. Shield volcanoes have a broad rounded shape and gentle splattery eruptions often described as fire fountains. Strato volcanoes are sharp and steep sided and have violent explosive eruptions. But what makes these two types of volcano look and erupt so differently? It is mainly controlled by how think (viscous) or runny the magma in the volcano is...

In this experiment you can use 3 different thickness (viscosity) liquids to see what differences runny or thick magma can cause in volcanoes.

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

Download the instructions and infomaration sheet.