"How was one of the world’s thickest “reefs,” the 4,050-foot (1,230 m) Eniwetok Atoll in the Pacific Ocean, built so quickly after the Flood? A process called “geothermal endo-upwelling” could be the answer. The underwater volcano provided heat to draw cold, nutrient-rich water into a growing mound of limestone. Microbes helped to precipitate lime out of the water until it got near the surface, when reef animals began to live on the mound. Drilling showed that the mound consists mostly of “chalky” limestone material, not coral reef organisms."