Coral is made of a compound called Calcium Carbonate. When ancient coral died and was covered by sediment, it becomes limestone, basically. I'm sure the process is much more complex than this.
Due to weathering of seawater. ;
Limestone originating from coral can be found on land due to geological processes involving erosion and tectonic activity. The uplift of land that was once underwater exposes the limestone formed from degraded coral. Examples include regions like the Florida Keys where these limestone formations are visible.
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