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An Introduction to Geology

An Introduction to Geology

Free Textbook for College-Level Introductory Geology Courses

extrusive

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Igneous rock cooling, and thus forming, outside of the Earth, i.e. on the surface.

Synonyms:
volcanic rock, extrusive rock
Related Articles:
  • Glossary: groundmass
  • Glossary: andesite
  • Glossary: basalt
  • Glossary: mafic
  • Glossary: ultramafic
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Author: Chris

Assistant Professor, Salt Lake Community College, Salt Lake City, Utah View all posts by Chris

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Chapters

  • Cover
  • 1 Understanding Science
  • 2 Plate Tectonics
  • 3 Minerals
  • 4 Igneous Processes and Volcanoes
  • 5 Weathering, Erosion, and Sedimentary Rocks
  • 6 Metamorphic Rocks
  • 7 Geologic Time
  • 8 Earth History
  • 9 Crustal Deformation and Earthquakes
  • 10 Mass Wasting
  • 11 Water
  • 12 Coastlines
  • 13 Deserts
  • 14 Glaciers
  • 15 Global Climate Change
  • 16 Energy and Mineral Resources
  • Glossary
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