{"schema":"pubphys.bundle/1","record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"7e99695eede0954cdf75db0008d712b7cc6f0b756bc0ee194b4b479513ce671c","created":"2026-10-03T07:18:02Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["5475cf5dc5b1a72283d26dc95dc6e00d7ea4e00096a7c6492e409a1816eeb011"],"salt":"1f7a5f144d626ffab891888d2ba9d56e1220c888731c4108f6f52d67bbecf669","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"revision"},"content":{"answer_type":"value","assisted_by":[],"external_id":"earth.earth-moon-origin.water-inventory","kind":"well-posed","literature_status":"open","n":"1","parents":[],"plain":"The oceans hold only part of Earth's water; more is locked in minerals deep inside, and hydrogen may also be dissolved in the iron core. 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 $1.4e24\\,\\mathrm{g}$ 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":null,"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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