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The Evolution of the Igneous Rocks
The science of igneous petrogenesis is a study of the origin and evolution of rocks that have formed through the generation of magmas by melting processes, and the cooling of those magmas from a liquid, or liquid and crystalline state, into a glassy to crystalline state. Field and textural observations do not constitute sufficient evidence for defining a rock as igneous in origin but when allied with experimental studies on silicate melts similar in composition to the rock question, the origin of the rock can be verifed.
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