Johannes Kalbe

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Questions related from Johannes Kalbe

Where can I get a sample of the Neo-Archean quartz conglomerate of Witwatersrand, South Africa, for teaching purposes?

I'm looking for a sample of the quartz conglomerates with the pyrite sands/pebbles from the Witwatersrand Super-group in South Africa. I need it for teaching of earth history lectures, to show the...

08 April 2015 334 6 View

What is the maximum load on dissolved minerals (chlorides, sulphates) in drinking water humans can deal with to survive in desert environments?

Regarding adaptions of prehistoric hominins to drinking water resources, what is the maxima in brackish waters modern humans from native and indigene groups living in such environments can deal...

09 March 2015 7,887 10 View