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Basalt - Igneous rocks
Basalt | Definition, Properties, & Facts | Britannica
Basalt - Wikipedia
Basalt - Geology Superstore
A Guide to Basalt: A Common, Fine-grained, Dark-Colored Volcanic Rock | Geology Base
BASALT ROCK | americanlandscape
Difference Between Basalt and Granite | Difference Between
10 Breathtaking Basalt Columns Around the World
Geology - rocks and minerals
What Is Basalt?
EISCO Raw Basalt, Igneous Rock Specimen - Approx. 1" - Geologist Selected & Hand Processed - Great for Science Classrooms: Amazon.com: Industrial & Scientific