Anaerobic digestion with H2 being generated as part of the breakdown of organic matter.

  • Hydrogen is an intermediate product in the breakdown of organic matter by organism in the soil

  • Can happen in soil and can lead to incorrect identification of large natural hydrogen resources

  • A simple fermentation experiment of organic material in a closed environment will allow the measurement of elevated H2

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High thermal maturation of organic hydrocarbon source rocks
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Cataclasis: crushing silica in the presence of water