Limestone Cave Model

To make a model of a limestone cave, take a plastic bottle and invert it in a glass bottle, covering the mouth of the plastic bottle with foil. Punch a few holes in the foil. Layer sand and sugar. Pour in warm water. We didn't get a full cavern, but we did get cave tunnels.



Source:
Geology Crafts for Kids by Anderson, Diehn and Krautwurst.

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