Glossary :: N

Natural selection: Differential reproductive success. Produces descent with modification, i.e. evolution.
Neomorphism: A diagenetic transformation of a mineral and itself or a polymorph, including differences in size and shape.
Nephelinite: A silica-undersaturated volcanic igneous rock containing nepheline and pyroxene.
Neutral theory of molecular evolution: Predicts that alleles are fixed at a constant rate for a given gene over long periods and that most molecular variation is selectively neutral.
Nomenclature: The method of naming species of animals and plants scientifically.
Normal Fault: A fault caused by extension.
Nuees Ardentes: See Pyroclastic Flows.

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