The former uses a long spring to find out how earthquake waves travel through the Earth and in the latter, pupils are pushed around to demonstrate the properties of seismic waves!
This demonstration can be used in the context of a lesson on wave motion for its own sake, or, as here, in explaining how seismic waves can be used to show the nature of the interior of the Earth.
There are many more activities your pupils can use to find out about the interior of the Earth - search on the ELI website.
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