Igneous Rocks
By Lacey Olson, Jayna Tabke, Chelsea Pilling, and Brittney Nolan (CHS Class of 2009)
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ACROSS 3. An igneous rock's _____ can be classified as felsic, mafic, intermediate, and ultramafic according to its mineral composition. 8. _____ melting. Process in which different minerals melt into magma at different temperatures, adding elements to the magma mix. 9. Light-colored igneous rocks that contain quartz and feldspars and have high silica contents. 10. Fine-grained igneous rock that is formed when lava solidifies on Earth's surface. 12. Magma that flows out into Earths surface. 13. _____ rocks. Intrusive or extrusive rock formed from the cooling and crystallization of magma or lava. 14. Igneous rocks with very low silica content and very high levels of magnesium and iron. |
DOWN 1. Vein deposits of extremely large grained minerals that can contain rare ores such as lithium and beryllium. 2. Rare, ultramafic rock that can contain diamonds and other minerals formed only under very high pressures. 4. Coarse-grained igneous rock that is formed when magma cools slowly and solidifies in Earth's crust. 5. Rock texture characterized by large, well-formed crystals surrounded by finer-grained crystals of the same mineral. 6. _____ reaction series. Sequential, predictable, dual-branched pattern in which minerals crystallize from cooling magma. 7. _____ crystallization. Process in which different minerals crystallize from magma at different temperatures, removing elements from magma. 11. Dark colored igneous rocks that are rich in iron and magnesium. |