{"record":{"author":{"account_ref":null,"orcid":null},"builds_on":[],"content_schema":"pubphys.content.topic/1","content_sha256":"1656a489e345600509db43a4a2d0ac21550269d5b3898b8f6771726c94ba0925","created":"2026-10-03T07:17:51Z","files":[],"origin":{"assisted_by":[],"kind":"seed"},"parents":[],"salt":"bbfa4be15f6abd3155cac956fb36da3f493d542dd54f8247bb1590a305c81152","schema":"pubphys.record/2","site":"pubphys.com","target":null,"type":"topic"},"content":{"external_id":"earth.inner-core","field":"earth","n":"1","review_cite":"Renaud Deguen, Structure and dynamics of Earth's inner core, Earth and Planetary Science Letters, 2012","review_link":"https://doi.org/10.1016/j.epsl.2012.04.038","review_verified":"true","summary":"At the center of Earth is a solid iron ball about 1220 km in radius, growing as the liquid core around it freezes. How old it is, why seismic waves cross it faster in some directions, and how it turns relative to the rest of the planet are all disputed.","title":"Inner core age, anisotropy and rotation","topic_ref":null,"why":"The inner core's growth powers the present geodynamo and records the thermal history of the deep Earth."},"attested":{"attestation":{"batch":null,"client_id":null,"id_token_sha256":null,"kind":"platform"},"record_hash":"7cfe9fc58e1f6e93abcae219320fa93156a5400d6286e67a83bb0bb8981c5f56","schema":"pubphys.attested/1"},"envelope":{"attested_hash":"3c28fd27d30730c4f197f14c9d54472f3cce659876e2211ed93a44314311a116","platform_signature":{"key_id":"c6afc19b31429869751f06879c75cd64ea92654423d15b44be775bf1310a60da","sig":"JVSZSmuUvfvOvSm3PjqKE3htCaUOCJJcK7QTLn1hNGMmUtBBUfVC4yXm4uH3f8mhIcponPrZweP9HcXgiPe8DQ"},"schema":"pubphys.envelope/1"},"record_hash":"7cfe9fc58e1f6e93abcae219320fa93156a5400d6286e67a83bb0bb8981c5f56","leaf_index":201}