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Estimates of the hidden amount vary from less than one ocean to many.","posed_since":"","precise":"Determine the bulk-Earth hydrogen inventory expressed in ocean masses (1 ocean is about $1.4 \\times 10^{24}\\,\\mathrm{g}$ of water), split among oceans, mantle and core. Mantle estimates range from below one to a few oceans and core estimates up to tens of oceans equivalent depending on metal-silicate partitioning. An answer is each reservoir's content with uncertainty below a factor of two.","problem_ref":"b0e43c878f2b85cc17696e34ed08475bb2065578e508e1c83feeb396e54a6144","references":"","settled_by":"Experimental hydrogen partitioning at core-formation conditions plus mantle water mapping from electrical conductivity and seismic attenuation.","status_note":"","title":"How much water is stored in Earth's mantle and 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