In organic substances present underground may also arise some similar to marsh gas, CO, H2, O3, also some of those as highly ionized atoms and molecules.
Katika nyenzo Organic sasa chini ya ardhi inaweza pia Ondoka Sawa na baadhi gesi Marsh, CO, H 2, O 3, pia baadhi ya wale wenye atomi yenye ionized na molekuli.