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September 23, 2011

September 23, 2011. Bellringer : Answer on Bellringer sheet… write out question and answer . Objective: Identify rocks using physical characteristics. Agenda: Rock Notes Lab 9: Rocks. Form by solidification (crystallization) of melted minerals

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September 23, 2011

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  1. September 23, 2011 Bellringer: Answer on Bellringer sheet… write out question and answer

  2. Objective: • Identify rocks using physical characteristics • Agenda: • Rock Notes • Lab 9: Rocks

  3. Form by solidification (crystallization) of melted minerals At the surface, LAVA hardens to form EXTRUSIVE rocks with tiny (FINE-GRAINED) crystals or GLASSY (no crystal) TEXTURES Beneath the surface, MAGMA hardens to form INTRUSIVE rocks with easily visible (COARSE-GRAINED) crystal texture. IGNEOUS ROCKS

  4. Granite • Light-colored, coarse- grained, no pattern • Mostly quartz, feldspar, mica, and hornblende • Often used for buildings and monuments

  5. Basalt • Dark-colored, fine- grained, extrusive • Formed where lava erupted onto surface • Most widespread igneous rocks

  6. Gabbro • Dark-colored, coarse- grained intrusive • Similar composition to basalt—plagioclase feldspar with some pyroxene and olivine

  7. Obsidian • Natural volcanic glass • Forms when lava cools very quickly • Usually dark, but small pieces may be clear • Fractures along curved (conchoidal) surface • Used as spear and arrow points, knives http://www.volcanoworld.org/vwdocs/vwlessons/lessons/Slideshow/Igrocks/Igrock7.html

  8. Pumice and other igneous rocks • Light colored, frothy (many air spaces)

  9. Formed by heat and pressure changing existing rocks REGIONAL METAMORPHIC affects a large area and results from plate tectonics CONTACT METAMORPHISM affects rocks on a local scale, such as “baking” sedimentary rocks next to magma or lava Metamorphic Rocks

  10. “Foliated” rocks contain much mica and other rocks that produce layering or banding

  11. Non-foliated metamorphic rocks include marble, which comes from limestone, and quatzite, which comes from sandstone

  12. Ticket out the door

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