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Igneous Rocks - National Geographic Society
Igneous Rocks – Types, Properties, and Examples - Science Notes …
Igneous rock | Characteristics, Examples, Formation, & Types
Igneous rock - Wikipedia
What are igneous rocks? | U.S. Geological Survey - USGS.gov
Igneous Rocks | Pictures of Intrusive and Extrusive Rock Types
Igneous Rocks - Definition, Characteristics, Types, Examples & Uses
Igneous Rocks - Geology (U.S. National Park Service)
Types of Rocks – Igneous, Sedimentary, Metamorphic
Pictures and Descriptions of Igneous Rock Types - ThoughtCo