{"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 core?","topic_ref":"2c5f38711046508a948faca95664ccbcabc745d5947f380901ca76f3f292f063"},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"b0e43c878f2b85cc17696e34ed08475bb2065578e508e1c83feeb396e54a6144","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"2a9f956a577322489b15c87bf26f95ea2e07465f620e35fcd2005e23c72dc9cf","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"zgl4TwDDXD5qeQGOkM8C6kSXUY2mV1Uq-ml9BsbJQyGRU28puA_WYWBnz02-xVJliUhTllagTVxXnmZ5JvB3BA"},"schema":"pubphys.envelope/1"},"record_hash":"b0e43c878f2b85cc17696e34ed08475bb2065578e508e1c83feeb396e54a6144","leaf_index":1306}