In geology, what is the process by which organic material is turned to stone by naturally impregnating it with silica or iron and sulfur?
Petrified Silicification Silicified Petrify Petrifications Petrification Petrifaction Petrified fossils
petrifications petrified fossils silicified silicification petrify petrifaction petrification petrified
petrification
WikipediaEntity
Petrification