This slide show is intended to help you understand important types of rocks.
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1 Rocks Mrs. Comer
2 This slide show is intended to help you understand important types of rocks. The diagram in the next slide represents the ROCK CYCLE a scheme that represents the processes of continuous changes that connect the three major groups of rocks: SEDIMENTARY IGNEOUS METAMORPHIC It also shows two other important parts of the Rock Cycle SEDIMENTS and molten LAVA and MAGMA Source: com/junior/rock_cycle.html
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4 Here is another version of the Rock Cycle
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6 Sedimentary Rocks Sedimentary rocks may be made of rock fragments sediments or by chemical reactions. The classification of sediments is shown below.
7 Clastic rocks made of cemented sediments are classified by their grain sizes.
8 Non-clastic rocks form by chemical precipitation (settling out from a solution.) Limestone is made from calcite, chert from quartz, and halite is rock salt.
9 Biologic sedimentary rocks come from the remains of organic matter. The most important of these is coal. Anthracite coal results from the greatest pressure and releases the most energy when burned. Other varieties are bituminous and lignite. Petrified (permineralized) wood is another organic rock.
10 More about sedimentary rocks Shale is the most common sedimentary rock Sedimentary rocks cover about threequarters of the land surface For more about sedimentary rocks:
11 IGNEOUS ROCKS 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.
12 Granite Light-colored, coarsegrained, no pattern Mostly quartz, feldspar, mica, and hornblende Often used for buildings and monuments
13 Basalt Dark-colored, finegrained, extrusive Formed where lava erupted onto surface Most widespread igneous rocks Found locally in the Palisades along west shore of Hudson River, Connecticut River valley
14 Gabbro Dark-colored, coarsegrained intrusive Similar composition to basalt plagioclase feldspar with some pyroxene and olivine
15 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
16 Pumice and other igneous rocks Light colored, frothy (many air spaces) Same minerals as in granite, but finer in grain size For more about igneous rocks: org/vwdocs/vwlessons/lessons/igrocks/igrocks1.html
17 Metamorphic Rocks 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 For more information:
18 Foliated rocks contain much mica and other rocks that produce layering or banding Gneisses and schists are common in New York City and Westchester. html
19 Non-foliated metamorphic rocks include marble, which comes from limestone, and quatzite, which comes from sandstone
20 Additional Resources There are many web sites that can provide you with more information about rocks. Most of these slides come from Volcano World. You can learn more from their slide show at org/vwdocs/vwlessons/lessons/slideshow/ Slideindex.html
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