composition « Back to Glossary IndexThe mineral make up of a rock, i.e. which minerals are found within a rock. Synonyms: composedRelated Articles: 11 WaterGlossary: continental crustGlossary: assimilation2 Plate Tectonics3 Minerals« Back to Glossary Index Author: Chris Associate Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris