This activity demonstrates how tiltmeters on volcanoes work. If the volcano 'bulges', changing shape because the magma beneath is rising, the liquid in the tiltmeter will move - sending an electric signal 'back to base'.This an easy activity to set up and carry out. It could form part of a lesson about volcanic eruptions and their effects. Is it better to use one source or several in trying to predict an eruption? How do you prepare a response to an eruption in a volcanic area? Please let us know what your pupils think.
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