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Topic: Sedimentary rock


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In the News (Tue 16 Jul 19)

  
  About Stone
Of the three generally sedimentary rock is the softest and absorbs most moisture and igneous rock is the hardest and least absorbent.
Sedimentary rock is due to sediments being laid down over time it is formed in four main ways—by the deposition of the weathered remains of other rocks; by the accumulation and the consolidation of sediments; by the deposition of the results of biogenic activity i.e.
Sedimentary rocks are formed from overburden pressure as particles of sediment are deposited from the air, ice or water where the particles were carried in suspension.
www.allnaturalstone.co.uk /AboutStone.htm   (610 words)

  
  Sedimentary rock
Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in three main ways—by the deposition of the weathered remains of other rocks (known as 'clastic' sedimentary rocks); by the deposition of the results of biogenic activity; and by precipitation from solution.
Sedimentary rocks are formed from overburden pressure as particles of sediment are deposited out of air, ice, or water flows carrying the particles in suspension.
Rock particles in the form of clay, silt, sand, and gravel, are transported by the agents of erosion (usually water, and less frequently by ice and wind) to new locations and redeposited in layers, generally at a lower elevation.
www.marble.com /countertops/encyclopedia/67/sedimentary,rock.html   (0 words)

  
 technical ceramics, marble, granite, travertine, stone, slate, quartzite, porphyry
Calcareous rock as a chemical deposit is obtained from soluble calcium bicarbonate that precipitates in spheroidal aggregates in the form of calcium carbonate.
Metamorphic calcareous rock is known as marble, the saccharoid structure of which is obtained through the crystallisation of organic calcareous rock.
Eruptive rock derives from the consolidation of magmas and sedimentary rock derives from chemical, clastic, pyroclastic and organic deposits.
www.irisfmg.com /eng/glossary.asp   (0 words)

  
 Rock Cycle and rock cycle answers
Chemical weathering is when the rock is chemically attacked: An example of this is the breakdown of limestone by acid rain.
If the rock has large crystals it means that it slowly cooled, the molten rock solidifies deep down within the crust without ever reaching the surface via an eruption.
Carbon dioxide and water dissolved in the molten rock is released with the decrease in pressure as it reaches the surface.
www.moorlandschool.co.uk /earth/rockcycle.htm   (1040 words)

  
 Granite and Marble Magazine ~ Articles about Natural Stone
Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in three main ways—by the deposition of the weathered remains of other rocks (known as clastic sedimentary rocks); by the deposition of the results of biogenic activity; and by precipitation from solution.
Tuff (from the Italian "tufo" and pronounced "toof") is a type of rock consisting of consolidated volcanic ash ejected from vents during a volcanic eruption.
Sandstone is an arenaceous sedimentary rock composed mainly of feldspar and quartz and varies in colour (in a similar way to sand), through grey, yellow, red, and white.
www.graniteland.com /stone/info.php   (1956 words)

  
 Slate & Sedimentary Rock Information From The Stone Network - The Natural Stone Business Resource Directory Portal
Slate is a fine-grained homogeneous sedimentary rock composed of clay or volcanic ash which has been metamorphosed (foliated) so as to develop a high degree of fissility or slaty cleavage which is usually at a high angle to the planes of stratification.
Sedimentary rocks are formed from overburden pressure as particles of sediment are deposited out of air, ice, or water flows carrying the particles in suspension.
Sedimentary rocks are classified as clastic, that is, they are composed of discrete clasts of material (rather than being composed of organic material as is the case for a limestone).
stone-network.com /petrology/slate.html   (720 words)

  
  Sedimentary Rock - Paleontology and Geology Glossary
Sedimentary rock is rock that has formed from sediment, like sand, mud, small pieces of rocks.
Sedimentary rock layers that were formed in water frequently has ripple marks.
Sedimentary rock layers that have crackles from drying mud were formed in shallow water that evaporated.
www.enchantedlearning.com /subjects/dinosaurs/glossary/Sedimentaryrock.shtml   (386 words)

  
 [No title]   (Site not responding. Last check: )
Sedimentary rocks are formed from overburden pressure as particles of sediment are deposited out of air, ice, or water flows carrying the particles in suspension.
Sedimentary rocks are composed largely of silica (i.e.
Sedimentary rock is one of the three main rock groups.
wikiwhat.com /encyclopedia/s/se/sedimentary_rock.html   (310 words)

  
 ScienceDaily: Sedimentary rock   (Site not responding. Last check: )
Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion)caused mainly by friction of waves, transportation where the sediment is carried along by a current, deposition and compaction where the sediment is squashed together to form a rock of this kind.
Sedimentary rock -- Sedimentary rock is one of the three main rock groups (along with igneous and metamorphic rocks) and is formed in four main ways: by the deposition of the weathered remains of other rocks (known as...
Sandstone -- Sandstone is a sedimentary rock composed mainly of sand-size mineral or rock grains.
www.sciencedaily.com /encyclopedia/sedimentary_rock   (1460 words)

  
 Metamorphic rock article - Metamorphic rock rock metamorphism sedimentary rock igneous rock crust Earth - What-Means.com
The protolith may be sedimentary rock, igneous rock or another, older, metamorphic rock.
They are also formed by the intrusion of molten rock, called magma, into solid rock, and form particularly at the place of contact between the magma and solid rock where the temperatures are high.
Matasomatism is the drastic change in the bulk chemical composition of a rock that often occurs during the process of metamorphism, and it is due to the introduction of chemicals from other surrounding rocks.
www.what-means.com /encyclopedia/Metamorphic_rock   (849 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)

  
 Sedimentary Rock
Sedimentary rocks are the 'used cars' of the rock world.
The most common sedimentary rocks are clastic - they are formed from bits and pieces of pre-existing rock which have been weathered, eroded and transported to an area where they are deposited together (usually in a low place, like in a valley, an ocean, a lake or other low spot on the Earth).
This rock is deposited in a non-water environment, or in an area where water did flow long enough to round the edges of the clasts.
www.rhprep.org /phorton/RockWeb/2SedimentaryRocks.htm   (491 words)

  
 Amateur Geologist Structured Geological Glossary: Sedimentary Rocks
Sedimentary rock composed of mineral that were precipitated from water.
A detrital sedimentary rock composed of grain from 1/16 to 2 millimeters in diameter, dominated in most sandstone by quartz, feldspar, and rock fragments, bound together by a cement of silica, carbonate, or other mineral or a matrix of clay minerals.
Clay originating in the soft sediment or sedimentary rock where it is identified and where it formed either by neoformation (i.e., from dissolved elements) or by transformation (i.e., from mineral growth on preexisting sedimentary substrate).
www.amateurgeologist.com /content/glossary/rock/sedimentary.html   (2021 words)

  
 Sedimentary Rock Encyclopedia Article @ FbgArt.com (Fbg Art)   (Site not responding. Last check: )
Four basic processes are involved in the formation of a clastic sedimentary rock: weathering (erosion), transportation, deposition and compaction.
Other examples include stromatolites, the flint nodules found in chalk (which is itself a biogenic sedimentary rock, a form of limestone), and coal (derived from the remains of tropical plants and subjected to pressure).
In addition, sedimentary rocks often form porous and permeable reservoirs in sedimentary basins in which petroleum and other hydrocarbons can be found (see Bituminous rocks).
www.fbgart.com /encyclopedia/Sedimentary_rock   (1279 words)

  
 Sedimentary Rock: Face of the Earth   (Site not responding. Last check: )
Sedimentary rock is formed when mineral matter of plants and animals settle out of water and, less commonly, air or ice.
After thousands of years, sedimentary rock is formed by many compact layers of rock building up pressure from water and the weight of other layers of overlying rock squeezing the rock until it molds together.
For sedimentary rock to bed or to form broad, flat layers from the collection of grains of clay, silt, or sand settling in river valleys, or on the bottoms of lakes and oceans, there has to be a parent rock for the sediment to form around.
www.edu.pe.ca /southernkings/sedimentaryec.htm   (344 words)

  
 Sedimentary Rock Laboratory
Sedimentary rocks are important because they contain the historical record of ancient environments and life on Earth.
Approximately 75% of the rocks exposed at the Earth's surface are sedimentary rocks.
Sedimentary rocks are grouped according to their origin into (1) terrigenous sedimentary rocks (also called detrital or clastic sedimentary rocks), which form from fragments of pre-existing rocks, (2) chemical and biochemical sedimentary rocks, which form as chemical precipitates, or from the shells of organisms, and (3) organic sedimentary rocks, composed of organic matter or carbon.
gpc.edu /~pgore/geology/historical_lab/sedrockslab.php   (2610 words)

  
 Sedimentary rock - CreationWiki, the encyclopedia of creation science   (Site not responding. Last check: )
Sedimentary rocks are composites of pre-existing rocks that have been weathered and eroded, or pieces of once-living organisms.
Although sedimentary rocks can form today, it is believed by creation scientists that the majority of the Earth's strata was formed catastrophically during the Biblical flood of Noah.
On the otherhand, uniformitarian geologists hold to the view that most sedimentary rocks were formed slowly and gradually at current rates of erosion and deposition.
creationwiki.org /Sedimentary_rock   (493 words)

  
 Sedimentary Rock
Sedimentary rock, one of the 3 major classes of rock comprising the Earth's crust (the others being IGNEOUS and METAMORPHIC), is made up of loose, unconsolidated sediment that has been transformed into rock (ie, lithified) during GEOLOGICAL HISTORY.
Sedimentary rocks are classified by their mineral and chemical composition and by the source of the sediment.
The islands' rocks are a striking example of sedimentary rock formations left by retreating glaciers, and are noted for picturesque limestone cliffs (Corel Professional Photos).
www.thecanadianencyclopedia.com /index.cfm?PgNm=TCE&Params=A1ARTA0007264   (181 words)

  
 chapt06
Sedimentary rocks exhibit a wide variety of colors, including white, gray, yellow, brown, red, purple, and green, so color is not a consideration in identifying these rocks.
The rounded fragments are weathered fragments of pre-existing igneaous, metamorphic, or sedimentary rocks.
A clastic sedimentary rock composed of fragments that have the size of sand grains (1/16 to 2 mm).
www.csun.edu /~vcgeo004/chapt06.htm   (290 words)

  
 Geoscience - The Earth - Shaping the Earth - Sedimentary processes and rocks
Sedimentary rocks form by the breakdown (both physical and chemical) of pre-existing rocks (these may be of igneous, metamorphic or sedimentary origin).
Sedimentary geologists (known as sedimentologists) tend to study both present-day sediments and older sedimentary rock sequences.
Most sedimentary sequences that are preserved in the rock record are formed from catastrophic deposition such as floods, mud flows, rock slides and melting of glaciers.
www.amonline.net.au /geoscience/earth/sedimentary.htm   (3868 words)

  
 Canyonlands National Park - Glossary of Terms (U.S. National Park Service)
A sedimentary rock composed of gravel, cobbles and boulders mixed in with sand or mud.
Sedimentary or igneous rocks heated and/or compressed until the minerals in the rock break down and form new minerals without melting.
Rocks formed by the deposition or accumulation of pieces of weathered rocks that later were buried and cemented, or glued, together.
www.nps.gov /cany/naturescience/glossary.htm   (452 words)

  
 Sedimentary Rock Identification Exercise
Sedimentary rocks are rocks are rocks are formed by materials that have been derived by the processes of weathering and erosion from other, pre-existing rocks at the Earth's surface.
Sedimentary rocks make up only about 5% of the Earth's lithosphere, but they are concentrated near the surface and actually represent about 75% of those rocks exposed at the surface.
Sedimentary rocks also have important commercial value as a source of petroleum, ground water, building materials, and economically valuable mineral deposits such as aluminum, gold, iron and others.
newterra.chemeketa.edu /Faculty/fraa/rocks/sedimentary/sedrxs.htm   (535 words)

  
 USGS Geology in the Parks
Sedimentary rocks are formed from pre-existing rocks or pieces of once-living organisms.
Pieces of rock are loosened by weathering, then transported to some basin or depression where sediment is trapped.
Shale is a rock made mostly of clay, siltstone is made up of silt-sized grains, sandstone is made of sand-sized clasts, and conglomerate is made of pebbles surrounded by a matrix of sand or mud.
wrgis.wr.usgs.gov /docs/parks/rxmin/rock2.html   (315 words)

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