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6-2 Study Stack
Rocks
Term | Definition |
---|---|
Igneous Rock | Crystalline |
Magma | forms when rock melts |
Intrusive | Magma cools below ground; larger crystals can form |
Extrusive | Lava that tools at the surface |
Coarse-Grained | granite |
Fine-Grained | rhyolite |
Porphyritic | Rock with a mix of large and small crystals; granite is an example |
Glassy | obsidian |
Vesicular | pumice |
Felsic | forms from magma with high concentration of silica. ( Ex: granite) |
Mafic | forms from magma with concentration of iron and magnesium. ( Ex: basalt) |