Geological process
The return of lithosphere to the mantle at subduction zones, which balances the creation of new crust at spreading centres and keeps the size of the Earth effectively constant.
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Crust is destroyed along convergent boundaries where plates move toward each other and one sinks beneath the other; the place where sinking occurs is a subduction zone.
Evidence support: Supported by the cited evidence one source
Evidence: Kious 1996 Primary authority
Record last updated 2026-09-06. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.