"Earth's Missing Geothermal Flux" at FauxScienceSlayer website
Virtually ALL of Earth's groundwater is fission produced, either from Hydrogen and Oxygen daughter atoms, forced into molecules under high heat and pressure, or condensed from molten rock. Earth's atmosphere is constantly being ionized by solar radiation, or blown away by solar wind. Likely lunar water is billion year accretion during full Moon in Earth's vapor trail.