natural gas « Back to Glossary IndexGaseous fossil fuel derived from petroleum, mostly made of methane. Related Articles: 15 Global Climate Change16 Energy and Mineral Resources5 Weathering, Erosion, and Sedimentary Rocks9 Crustal Deformation and EarthquakesGlossary: fossil fuel« Back to Glossary Index Author: Chris Associate Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris