Diatomaceous earth (DE)
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1. The skeletal remains of prehistoric microorganisms called "diatoms", often used as an inorganic soil amendment.
Here diatomaceous earth is being used in a classroom project.
Source: http://www.museum.state.il.us/scilit/geoexplorer/classroom/lashbrook1/
Diatomaceous earth product being incorporated into a putting green.
Source: http://www.sportechnic2000.com/ axis.html