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Topic: Rock (geology)


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  Rock (geology) - guideofcasinos.com
Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them.
Sedimentary rocks are formed by deposition of either detrital or organic matter, or chemical precipitates (evaporites), followed by compaction of the particulate matter and cementation.
The transformation of one rock type to another is described by the geological model called the rock cycle.
www.guideofcasinos.com /Rock_%28geology%29.html   (244 words)

  
 [Rock (geology)] | [All the best Rock (geology) resources at informationhunting.com]
Rocks are classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them.
Sedimentary rocks are formed by deposition of either clastic sediments, organic matter, or chemical precipitates (evaporites), followed by compaction of the particulate matter and cementation during diagenesis.
Mud rocks comprise 65% (mudstone, shale and siltstone); sandstones 20 to 25% and carbonate rocks 10 to 15% (limestone and dolostone).
www.informationhunting.com /Ponte_Vecchio/Rock_(geology)   (1100 words)

  
 Mojave Desert Geology
The study of the history of the physical development of the structure, content and life of the earth by application of the natural sciences to the physical formations found inside and on the surface of the earth.
The sample rocks in this tour are only "some" of the major geologic formations in the Death Valley area.
Yosemite is a glaciated landscape, and the scenery that resulted from the interaction of the glaciers and the underlying rocks was...
digital-desert.com /geology   (456 words)

  
  Grand Hikes: Grand Canyon Geology Overview
Rocks in the Vishnu Group were initially laid down on the sea floor and were composed of quartz rich sands, silts and clays, which were interspersed with ashes, lava flows and feeder dikes associated with a volcanic chain of offshore islands.
The Vishnu Group rocks are contemporaneous with the oldest known rocks throughout Arizona and the evidence and geologic record afforded by older rocks elsewhere on the Earth is so fragmented and incomplete as to render interpretations highly speculative and debatable.
Vishnu Group rocks were exposed at the erosion surface as the mountainous region and overlying rocks were eroded away and reduced to a hilly plain.
www.rockhounds.com /grand_hikes/geology/overview.shtml   (1998 words)

  
  Rock (geology) Summary
Examples of chemical sedimentary rocks are limestone (composed of calcium carbonate), rock salt (composed of sodium chloride), rock gypsum (composed of calcium sulfate), ironstones (composed of iron oxides), and chert (composed of hydrated silica).
Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them.
Plutonic or intrusive rocks result when magma cools and crystallises slowly within the Earth's crust, while volcanic or extrusive rocks result from magma reaching the surface either as lava (when the molten rock is in the mantle, it is called magma, when it is above the crust, it is called lava) or fragmental ejecta.
www.bookrags.com /Rock_(geology)   (1287 words)

  
  Rock (geology) - Wikipedia, the free encyclopedia
Rocks are classified by mineral and chemical composition; the texture of the constituent particles; and also by the processes that formed them.
Plutonic or intrusive rocks result when magma cools and crystallises slowly within the Earth's crust, while volcanic or extrusive rocks result from magma reaching the surface either as lava (when the molten rock is in the mantle, it is called magma, when it is above the crust, it is called lava) or fragmental ejecta.
Sedimentary rocks are formed by deposition of either detrital or organic matter, or chemical precipitates (evaporites), followed by compaction of the particulate matter and cementation.
en.wikipedia.org /wiki/Rock_(geology)   (324 words)

  
 Rock - Wikipedia, the free encyclopedia
Rock and roll, a genre of popular music, which developed in 1950s and '60s, from which all rock music evolved
Rock (confectionery), a confectionery made and sold in many of the UK's seaside holiday resorts, in the shape of a cylinder
Joseph Rock, (1884-1962), Austrian-American explorer, geographer and botanist
en.wikipedia.org /wiki/Rock   (309 words)

  
 Sedimentary Rock - Picture - MSN Encarta
Sedimentary rock, such as this sandstone, forms when layers of sediment are compacted and cemented together.
Nearly 5% of the top 15 km (10 mi) of the earth’s crust is made of sedimentary rock.
However, sedimentary rock constitutes nearly 75% of the exposed rock on the earth’s surface.
encarta.msn.com /media_461569676/Sedimentary_Rock.html   (48 words)

  
 Geology.com - Earth Science News, Maps, Dictionary, Articles, Jobs
Geology Dictionary: Look up definitions in our free geology dictionary.
Petroglyphs and Rock Art: A world-wide collection of rock art photos.
Uses of Granite: The rock used everywhere from the kitchen to the facing stone of skyscrapers.
geology.com   (602 words)

  
 Geology Rock Hammers
This is a chisel style rock hammer which is often favored by paleontologists and "soft rockers" who use the wide chisel end to excavate weathered and soft deposits.
These rock hammers are used by geologists to break small chips from a rock outcrop in order to have a fresh surface to examine with a hand lens.
The chisel end of a hammer is used as an excavating tool, for example to carve away weathered rock or dirt that may have a fossil or mineral embedded in it..
www.kooters.com /rockpick.html   (448 words)

  
 Ask Mikey about Geology, Rock Types & Miscellaneous, Rockhounding Arkansas
Shale is a sedimentary rock that may have a variety of colors, but because of its composition typically has partings that are parallel to the bedding of the layers of rock above and below it.
The most common rocks containing geodes are lavas that contain gas pockets and carbonate rocks which contain holes where other minerals dissolved away, sometimes during the formation of the rock from the original sediment (the process is called lithification and means "turn to stone").
Some sedimentary rocks are composed of materials formed from sea water, like gypsum or calcium carbonate, but like the other types (sandstone, siltstone, and shale), they are formed at or very near the surface.
www.rockhoundingar.com /askmikey/askMgeology.html   (3733 words)

  
 The Geology of Rock Canyon
During this phase layers of sedimentary rock accumulated in mostly shallow marine environments near the edge of the continental shelf.
This collision caused the flat-lying rocks, deposited in shallow marine conditions during Phase I, to be uplifted, folded, and thrust eastward.
In the Rock Canyon area, this extension is responsible for the uplift and formation of the Wasatch Mountains.
geologyindy.byu.edu /ftrips/rc/geology.htm   (618 words)

  
 An Introduction to Geology and Hard Rock Mining
Geology is the study of the earth, its surface configurations, and the physical and chemical processes acting upon its surface and its interior.
Rocks are classified not only according to their mineral content, but also in accordance with their mode of formation (igneous, sedimentary, metamorphic), chemical composition, grain-size, and physical appearance.
Rocks which become deeply buried are subjected to heat and pressure, which with the aid of contained or introduced fluids, and tectonic forces are metamorphosed.
www.rmmlf.org /SciTech/Lacy/lacy.htm   (14533 words)

  
 UCMP Glossary: Geology
Rock consisting of alternating light and dark layers of iron-rich chert (the dark layers have more iron minerals) formed from 3.8 to 1.7 billion years ago.
rock or sediments derived from debris of organic materials composed mainly of calcium and carbonate (e.g., shells, corals, etc.) or from the inorganic precipitation of calcium (and other ions) and carbonate from solution (seawater).
Describes a rock or sediment composed mainly of fragments of preexisting rocks or minerals that have been transported some distance from their place of origin, e.g., sandstone, shale.
www.ucmp.berkeley.edu /glossary/gloss2geol.html   (3545 words)

  
 USGS Paleontology - Glossary of Terms
The branch of geology concerned with the separation and differentiation of rock units by means of the study of the fossils they contain.
Lithostratigraphic unit; a body of rock that is consistently dominated by a certain lithology or similar color, mineralogic composition, and grain size.
Solid unconsolidated rock and mineral fragments that come from the weathering of rocks and are transported by water, air, or ice and form layers on the Earth's surface.
geology.er.usgs.gov /paleo/glossary.shtml   (2386 words)

  
 NPS - Earth Science Week - Geology Crossword   (Site not responding. Last check: )
Rock that has undergone chemical or structural changes produced by increase in heat or pressure, or by replacement of elements by hot, chemically active fluids.
Rocks that are formed from preexisting rocks or pieces of once-living organisms.
Rock formed when molten rock (magma) has cooled and solidified (crystallized).
www2.nature.nps.gov /Geology/esw/k_g_gcw.htm   (339 words)

  
 geology rock stones minerals free pictures
Rock is a substance composed of minerals and classified according to mineral composition.
Rocks are generally classified by the processes that formed them, and are thus separated into igneous, sedimentary, and metamorphic rocks.
Igneous rocks are formed from molten magma, sedimentary rocks by deposition and compression of particulate matter, and metamorphic rocks by either of the first two categories after being changed by the effects of temperature and pressure.
www.bigfoto.com /themes/nature/geology/index.htm   (165 words)

  
 84.06.01: Geology of Connecticut Soil, Rock and Minerals
Some rocks were frozen into the ice at its lowest level and it acted like a piece of sandpaper, smoothing down the rocky surface.
This rock material is sorted by waters from glaciers and left in layers as partially sorted gravel.
When a complex rock surface is subjected to sudden changes of temperature, the different minerals within the rock do not expand or contract equally.
www.yale.edu /ynhti/curriculum/units/1984/6/84.06.01.x.html   (3303 words)

  
 Geology   (Site not responding. Last check: )
These rock formations, consisting largely of shales, limestones, and sandstones, were deposited on the bottom of ancient seas that covered Michigan on and off for millions of years.
The igneous rocks are hard, crystalline, resistant to erosion, and are largely made up of granites and metamorphic rocks--rocks that have been changed through heat and pressure--composed mainly of gneisses and schists.
As you now know, the geology of Michigan is dominated by two rock formations: the sedimentary Michigan Basin, which covers the entire Lower Peninsula and the eastern half of the Upper Peninsula, and the old crystalline, igneous shield found in the western Upper Peninsula.
www.geo.msu.edu /geo333/geology.html   (644 words)

  
 College Geology Department, Physical Geology, metamorphic rock examples
These rocks either represent an originally layered protolith rock, original non-layer inhomogeneities that have been stretched out, or later formed inhomogeneities such as thin intruded dikes.
This rock is a labradorite-rich gabbro (anorthosite) from the Adirondacks.
The labradorite is medium gray and white, and the pyroxene is darker gray and slightly greenish.
www.union.edu /PUBLIC/GEODEPT/COURSES/geo-10/metamorphic.htm   (638 words)

  
 ROCK (GEOLOGY) Articles A rock is a naturally occurring agg
Rocks are classified by mineral and chemical composition, by the texture of the constituent particles and by the processes that formed them.
The mining of rocks for their metal ore content has been one of the most important factors of human advancement.
Rocks have been and continue to be used to construct buildings and infrastructure.
www.amazines.com /Rock_(geology)_related.html   (705 words)

  
 Geology 419 :: SuperTopo Rock Climbing Discussion Topic   (Site not responding. Last check: )
In the rocks of Yosemite and Joshua Tree quartz is the clearest of the grains, plag is the opaque white grain, and k-spare typically takes on a flesh to pinkish color.
And yet, aging studies of the batohlith suggest that the darker rocks near the western margin of the Sierra are OLDER than the granite varieties along the crest to the east.
Magma mixing, assimilation of host rocks deeper in the crust and other processes are important processes contributing to the compositional evolution of granites, etc. This stuff would show up in igneous petrology courses (or at least it should if your instructor is up to the times).
www.supertopo.com /climbing/thread.html?m=67076&f=0&b=0   (4405 words)

  
 ISM Geology Online - Lesson Plan 6.4: Ride the Rock Cycle   (Site not responding. Last check: )
The resulting intrusive igneous rock may be exposed later after uplift and erosion remove the overlying rock.
The igneous rock, being out of equilibrium, may then undergo weathering and erosion, and the debris produced is transported and ultimately deposited (usually on a sea floor) as sediment.
As the rock is buried the additional layers of sediment and sedimentary rock, heat and pressure increase.
geologyonline.museum.state.il.us /tools/lessons/6.4/lesson.html   (798 words)

  
 Geology - Rock Types
are rocks formed by the deposition, compaction and cementing of small particles (such as silt, sand and pebbles).
are formed by heat from magma (which is molten rock beneath the earth's surface), and are usually associated with volcanoes.
Metamorphic rocks may have originally been either sedimentary or igneous or metamorphic rocks.
qldscienceteachers.tripod.com /junior/geology/rocks.html   (337 words)

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