{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.revision/1","content_sha256":"b4df095359752c3aabad8d7193c42a0d5221695f612fe97a39acbf81f47bc853","created":"2026-10-15T23:43:22Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":["b0e43c878f2b85cc17696e34ed08475bb2065578e508e1c83feeb396e54a6144","ce59fb6cd812fc05906d0c60a71c75ea22bc686bcf38e7c3ef7010834d98ee7b"],"salt":"889d255493b3ac3fa2b357434b61b1ed8606bc0e68746d982401282457642001","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":"2","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 $1.4 \\times 10^{24}\\,\\mathrm{g}$ 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 core?","topic_ref":null},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"babf0aabb2d203283d248e10f2ed80a9f09589f6e91ff296e6b12ca0aa009ad6","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"a58eb1d391ea822d9480ba884c47b2f32a866eabaa2c60b062b0f1696346bfe7","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"5kBRE5DZu8QGdc8mkB6dp5j1_OF3b3qNZ9UX6U6j4c1kkrnjXBMi7A8QYfsDZDQNVnndqaiJed-6pLdtfiFdBw"},"schema":"pubphys.envelope/1"},"record_hash":"babf0aabb2d203283d248e10f2ed80a9f09589f6e91ff296e6b12ca0aa009ad6","leaf_index":3184}