Rock
A carbonate sedimentary rock formed from the remains of organisms or by direct precipitation from water. Under metamorphism it recrystallises into marble.
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Limestone can form when large numbers of organisms die and their remains accumulate, and it can also form by precipitating directly out of water.
Evidence support: Supported by the cited evidence one source
Evidence: U.S. Geological Survey n.d. Primary authority
Record last updated 2026-09-06. Corrections follow the published corrections policy; superseded claims are retained, never silently edited.