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Science 6-2
Igneous Rocks
Question | Answer |
---|---|
Igneous Rock | Formed when magma cools and hardens. |
Magma | Forms when rock melts. |
Crystalline | Rock that is full of crystals. |
Intrusive | Formed when magma cools beneath Earth's surface. It has larger crystals. |
Extrusive | Formed when magma cools at Earth's surface. It has smaller crystals. |
Coarse-grained | A texture of Igneous rock. One example is granite. |
Fine-grained | A texture of Igneous rock. One example is rhyolite. |
Porphyritic | A texture of Igneous rock. One example is granite. |
Glassy | A texture of Igneous rock. One example is obsidian. |
Vesicular | A texture of Igneous rock. One example is pumice. |
Felisic | Forms from magma with high concentration of silica. One example is granite. |
Mafic | Forms from magma with high concentration of iron and magnesium. One example is basalt. |