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*Ch 6 Rocks Igneous Rock Sedimentary Rock Metamorphic 100 100 100 100 Grab Bag 100 200 200 200 200 200 300 300 300 300 300 400 400 400 400 400 500 500 500 500 500 Terms Rock Rock that forms when magma cools and hardens Answer Igneous Rock Home Igneous rock that is rich in feldspars and silica and generally light in color Answer Felsic Rock Home Zones of weakness in an ingneous rock structure Answer Joints Home Batholiths, laccoliths, and sills are all examples of this______ Answer Intrusive igneous intrusions Home Igneous rock that is rich in Fe and Mg and is generally dark in color Answer Mafic Home Sedimentary rock that is made up of rock fragments that become compacted or cemented together Answer Clastic Rock Home Layers and bed of sedimentary rock are examples of ________ Answer Stratification Home This structure forms when finer sediments settle on the bottom and large grains settle on the top Answer Reverse grading Home Lumps that have compositions different from the main body of rock Answer Concretions Home Forms when minerals precipitate from a solution or settle from a suspension Answer . Chemical sedimentary Rock Home Rocks that forms when existing rock is altered by forces of heat, pressure or chemical processes Answer Metamorphic Home Changes in temperature and pressure over a large area Answer Regional metamorphism Home This texture results when extreme pressure causes minerals in Metamorphic rock to realign, or when minerals separate our into dark and light bands Answer Foliated Home An example of a nonfoliated rock used as a building or sculpting material Answer Marble Home Rock texture in which minerals are arranged in planes or bands is called ________ Answer Foliation Home Rocks from magma that cools deep inside Earth’s crust Answer Intrusive igneous Home “lake of rock” when magma pushes the overlying rock layers into a dome Answer Laccolith Home Formations that spread over 100 km squared Answer Batholiths Home Process in which sediments are glued together by minerals deposited in water Answer Cementation Home Rocks change from one type to another as a result of geologic forces and processes that are part of the ______ Answer The Rock Cycle Home A type of rock with vesicular texture Answer Pumice Home Texture with a mixture of large and small crystals Answer Porphyritic Home Forms from the remains of plants and animals Answer Organic Sedimentary Home Granite has large, welldeveloped crystals giving it what kind of texture? Answer Coarse-grained texture Home When magma forms by partial melting, which of the following mineral pairs melt first? Answer Quartz/ feldspar Home
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