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Es werden einerseits qualitative Experimente beschrieben, mit denen der Kalkkreislauf problemorientiert und phänomenologisch erarbeitet werden kann. Zum anderen wird ein einfaches quantitatives Experiment zur Ermittlung des Kalkgehalts biologischer Materialien wie Eierschalen und Muscheln vorgestellt, das mit einfachen Berechnungen ausgewertet werden kann.
On the one hand, qualitative experiments are described, which enable pupils to work out the lime cycle in a problem‐oriented and phenomenological way. On the other hand, a simple quantitative experiment is presented, with which the calcium carbonate content of biological materials can be found out without difficult calculations.