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	Rock flour - Wikipedia, the free encyclopedia
		Rock flour, or glacial flour, consists of clay-sized particles of rock, generated by glacial erosion or by artificial grinding to a similar size.
		Natural rock flour is typically formed during glacial migration, where the glacier grinds against rock beneath it, but is also produced by freeze thaw, where the act of water freezing and expanding in cracks helps break up rock formations.
		Rock flour is carried out from the system via meltwater streams, where the particles travel in suspension.
	en.wikipedia.org /wiki/Rock_flour (376 words)

	Glacial Deposition: Rock Flour
		Rock flour is the finely ground remains of rock.
		Rock flour is removed from the glacial system by meltwater streams which carry an assortment of debris of various sizes.
		The typical clue to the presence of rock flour is a milky blue/white colouration of the water.
	www.geography-site.co.uk /pages/physical/glaciers/flour.html (232 words)

	Glacier - Wikipedia, the free encyclopedia
		This flour is formed by rock grains of a size between 0.002 and 0.00625 mm.
		Chatter marks are seen as lines of roughly crescent shape depressions in the rock underlying a glacier caused by the abrasion where a boulder in the ice catches and is then released repetitively as the glacier drags it over the underlying basal rock.
		Rock on this side is fractured by combinations of forces due to water, ice in rock cracks, and structural stresses.
	en.wikipedia.org /wiki/Glacier (4605 words)

	Department of Geological & Atmospheric Sciences
		biogenic sedimentary rock A sedimentary rock composed primarily of biogenic sediments.
		The continental slope is underlain by crustal rocks of the continent.
		"crystalline rocks" as a rough synonym for "igneous or metamorphic rocks".
	www.ge-at.iastate.edu /courses/Geol_100/old_files/glossary.v2.html (14105 words)

	Delaware Geological Survey
		The rocks are mostly a mixture of metamorphic gneisses and plutonic igneous rocks.
		Because of this collision, the rocks of the ancient continent, the rocks in the volcanic range, and the rocks lying in the ocean between the continent and the range, were all folded, sheared and buried to depths of 10 to 12 miles where they were metamorphosed by extreme heat and pressure.
		The layering in the Wissahickon wall rock is irregular and defined by stringers of garnet, biotite and sillimanite in a mass of quartz and feldspar.
	www.udel.edu /dgs/Education/bluerocks.html (2705 words)

	NOVA \| Mystery of the Megaflood \| Ice Age Lake \| PBS
		Rock flour settled through the murky water and deposited as a layer of pale sediment on the floor of the lake.
		Glacial Lake Missoula surely became a splendid and brilliant greenish blue as the last of the summer rock flour settled and the larch trees blazed yellow in the deepening chill of the coming winter.
		The summer murk of suspended rock flour probably made the lake a poor habitat for most of the kinds of fish native to western Montana.
	www.pbs.org /wgbh/nova/megaflood/lake.html (1388 words)

	Montana's Earth Science Picture of the Week
		Sometimes called “glacial milk”, the unusual color is due to the presence of “rock flour”, which consists of tiny clay particles formed as rocks stuck to the bottom and sides of a glacier grind against bedrock.
		As the ice melts this rock flour is exposed and transported away by meltwater, often into a nearby tarn such as Cracker Lake.
		Apparently the tiny particles of rock flour suspended in the lake are just the right size to reflect more of the blues and some of the greens than any of the other wavelengths.
	formontana.net /cracker.html (344 words)

	Arthur Ross Hall of Meteorites \| American Museum of Natural History
		Both the pulverized rock, called rock flour, and the foamy-looking lechatelierite shown below are made of glass.
		The presence of these two types of rock is clear evidence that a meteorite impact briefly compressed the sandstone.
		These pieces of rock, some as large as houses, helped to prove that the crater was formed by a meteorite impact.
	www.amnh.org /exhibitions/permanent/meteorites/impacts/crater.php (843 words)

	Glacial Erosion And Transportation
		With it's load of abrasive rock fragments, the base of the glacier acts like a belt sander, scraping across the rock, eroding it, producing characteristic erosional features, and creating a supply of material that leads eventually to the formation of depositional features as well.
		Rock flour is so prevalent in the meltwater of some glaciers that the water is unsafe to drink.
		Small dark rocks can warm up faster than the surrounding ice, and melt their way into the surface of the glacier, where as larger rocks, especially light colours ones, may be slow to warm up and thus protect the ice below them.
	www.geography-site.co.uk /pages/physical/glaciers/erode.html (754 words)

	How Rocks Are Formed
		When rocks are exposed to the elements – air, rain, sun, freeze/thaw cycle, plants – erosion occurs and the little bits of rock worn away get deposited as sediments.
		Metamorphic rocks are the least common of the 3 kinds of rocks.
		Metamorphic rocks are igneous or sedimentary rocks that have been transformed by great heat or pressure.
	www.rocksforkids.com /RFK/howrocks.html (2284 words)

	Earth 2nd Edition > Glossary > Letter r
		Rock with high porosity and permeability, so it can contain an abundant amount of easily accessible oil.
		The new mound, or cone, of igneous rock that grows within a caldera as an eruption begins anew.
		A slow-moving mixture of rock fragments and ice.
	www.wwnorton.com /internal/earth2/glossary/r.htm (827 words)

	Geology Dictionary - Rhyolite, Rock Cycle - GEOLOGY.COM
		Mineral changes within a rock that are caused by adjustments to conditions of reduced temperature and pressure.
		The fine-grained volcanic or extrusive rocks that is equivalent in composition to granite.
		All rock at or near Earth's surface is being modified by the processes of metamorphism, melting, crystallization, lithification and weathering.
	geology.com /dictionary/glossary-r.shtml (938 words)

	McKenzie Rock Flour
		Powdered rocks and gravels are Nature's "fertilizer." Glaciers and volcanoes are the primary methods She uses to produce the powder.
		The rock was broadcast (spread) equally over the four acres -- right on top of the soil maintenance crop as well as underneath the grapevines -- using a small, standard tractor spreader about six feet wide driven between the rows.
		Rock fertilizers not only give nutrients over longer periods to cultivated plants, but also improve the ion-exchange-capacity of soils by forming new clay minerals during the weathering of the fertilizer.
	www.ibiblio.org /ecolandtech/permaculture/mailarchives/permaculture-links/msg00175.html (3622 words)

	Volcanoes of the Eastern Sierra Nevada
		Plucking is more effective with jointed rocks (rocks that have fractures but little displacement) and “roche moutonnee” (French term for an asymmetrical chunk of rock which is smooth by abrasion on one slope and rough and steep on the other due to plucking, and looks like a sheep).
		Small-grained fragments in the glacier polish the rock surface and produce “rock flour,” and larger fragments cause striations in the bedrock.
		Rock fragments must keep moving downwards to the base of the glacier to be effective abrasives, as moving ice will cause pieces in it to wear down eventually; melting at the glacial base will allow this shifting to occur.
	www.iub.edu /~sierra/papers/2003/Hong.html (1861 words)

	Bryce Canyon National Park: GEODETECTIVE Program (Site not responding. Last check: 2007-10-31)
		Rocks are made of one or more minerals.
		It is the same with rocks because each type of rock has a different combination (or recipe) of minerals.
		Even rocks with the same mineral ingredients may be different due to variations in the amounts of minerals (more flour, fewer chocolate chips) and the processes by which they are formed such as being burned, doughy, or just right.
	www.nps.gov /brca/geodet/geodet_properties.html (1648 words)

	HISTORY OF ROCK FALLS
		Rock Falls is in the same county as Mason City, in fact it is older than Mason City.
		In 1962, the Farmers Savings Bank at Rock Falls was robbed of an estimated $700 late one morning.
		TOWN LANDMARK: The Wilkinson Pioneer Park on the Shell Rock River was established when Edith and Rufus Wilkinson, lifetime residents of Rock Falls, gave 19 acres to the Cerro Gordo County Conservation Board for a park.
	www.rockfallsiowa.com /HISTORY.htm (1380 words)

	UW-Madison Geology 410 - Acid Mine Drainage
		In an intact rock beneath the surface, water flow is restricted to limited fractures in the rock, and it is typically poor in oxygen.
		In copper sulfide mines, for example, the mined rock is crushed into rock flour so that the desired copper can be dissolved out of it by (you guessed it) acid.
		The surface area of all the grains of rock flour is astronomically greater than the surface area of the original, intact rock, so the flour is extremely reactive.
	www.geology.wisc.edu /courses/g410/drainage.html (761 words)

	Peyto Lake, The Canadian Rockies
		This water is laden with finely ground particles of rock debris known as rock flour, which remains suspended in the water.
		It is not the mineral content of the rock flour that is responsible for the lake’s unique color, but rather the particles reflecting the blue-green sector of the light spectrum.
		As the amount of suspended rock flour changes, so does the color of the lake.
	www.moon.com /planner/canadian_rockies/mustsees/peytolake.html (247 words)

	Glossary of Terms: R
		A fine grained extrusive igneous rock that is rich in quartz and potassium feldspar.
		Normally occurs when the rock has well defined bedding planes that are exaggerated by freeze-thaw action or thermal expansion and contraction.
		Very finely ground rock fragments that form between the base of a glacier and the underlying bedrock surface.
	www.physicalgeography.net /physgeoglos/r.html (1357 words)

	[No title] (Site not responding. Last check: 2007-10-31)
		rock salt, maltodextrine, yeast extract, vegetables (tomatoes, paprika, onions), cane sugar, olive oil, spices (garlic, paprika, tumeric), herbs (thyme, oregano, rosemary).
		wholegrain roasted spelt flour, wholegrain spelt flour, yeast extract, yeast flakes, vegetables (onions, carrots, leek, parsnips, white cabbage, celeriac), rock-salt, spices (garlic, coriander, pimento), herbs (celeriac leaf, parsley).
		wheat flour, vegetables (celeriac, carrots, leek, onions), rock-salt, dried mashed potato, skimmed milk powder, palm fat, yeast extract, spices (garlic, pepper, nutmeg, turmeric), celeriac leaf, parsley.
	www.erntesegen.de /en/texte/zutaten.htm (1332 words)

	Flour (Site not responding. Last check: 2007-10-31)
		Rock Creek Organics hard red spring wheat is grown, stone ground into flour, and packaged by Great Grains Milling in northeastern Montana.
		Stone grinding is a special process that yields the desirable texture of fine flour and relatively coarse bran.
		The Golden Wheat flour has most of the bran removed and is used as a general purpose flour whereas the Whole Wheat flour is best for bread making.
	www.rockcreekorganics.com /flour.htm (203 words)

	Search Results for "flour" (Site not responding. Last check: 2007-10-31)
		...Finely ground rock particles produced by glacial abrasion.
		...A flour tortilla folded in half around a savory filling, as of cheese or beans, then fried or toasted.
		...Rolled in flour and fried in butter, usually with lemon juice and chopped parsley sprinkled on top.
	www.bartleby.com /cgi-bin/texis/webinator/sitesearch?FILTER=col61&x=10&y=12&query=flour (298 words)

	Glossary - Terms Q-R
		A mass of unsorted, generally angular rock material that has fallen from the adjacent wall of the bedrock valley onto the surface of a glacier.
		Rock flour is seen mixing with sedmient-free water at the confluence of a glacial and non-glacial stream in Denali National Park, Alaska.
		LANDSAT MSS satellite image showing large quantities of suspended sediment, composed of rock flour, in the Gulf of Alaska south of the Copper River, Alaska.
	pubs.usgs.gov /of/2004/1216/qr/qr.html (419 words)

	Discovery and Development of the Mines
		Geological Survey of Canada indicated that Steep Rock Lake held the potential of a "hematite of good quality [which] appears to be generally covered by the waters of the lake".
		The men of Steep Rock and their families who are living with them are doing too big a job to be cut off from the rest of Canada, to be kept from the ownership of a car and the privilege of driving through the beauty of the country they are helping to develop.
		Steep Rock Echo: The Atikokan Chamber of Commerce is waging a vigorous campaign for a road into this district from Shebandowan, 85 miles east of Atikokan.
	steeprock.freeservers.com /WPtimeline.html (5606 words)

	Flour : Machinery Hill - Listen, Review and Buy at ARTISTdirect
		Pete "Flour" Conway creates charmingly eccentric music that flows seamlessly from industrial punk through progressive rock to something almost approaching psychedelia.
		Flour's vocals are nothing special, a growl, spoken lyric, or croon fairly deep in the mix, but the strangely compelling mix of hardcore throb, intelligent lyrics, and unexpectedly delicate and lyrical guitar and keyboard work keeps listeners guessing.
		The final track is a practical joke on his audience that shouldn't be spoiled by telling you what it is. Just listen to the whole track, every minute of it, and you may find yourself laughing out loud.
	www.artistdirect.com /nad/store/artist/album/0,,87029,00.html (274 words)

	rock garden definition - Dictionary - MSN Encarta
		rock garden definition - Dictionary - MSN Encarta
		Search for "rock garden" in all of MSN Encarta
		garden with rocks: a rocky area in which plants suited to the habitat are grown
	encarta.msn.com /dictionary_1861705778/rock_garden.html (94 words)

	deep mine report (Site not responding. Last check: 2007-10-31)
		Apparently, these rock bolts did not yield only in the event of April 1999, and some of them yielded in previous events or by creep.
		One type of evidence for slip are the displaced boreholes of rock bolts in which both dip-slip and strike-slip components of the displacement could be evaluated (Fig.
		A steel drill bit used for rock bolting was left inside this gouge-zone during the tunnel, and it was “chopped” into four pieces during the earthquake (Fig.
	earth.es.huji.ac.il /reches/ZA (1860 words)

	Welcome from the Friends of Peirce Mill
		Rock Creek Park, Washington, DC Peirce Mill, the last extant 19th century gristmill in the District of Columbia, remains the principal relic of the Peirce Plantation and a symbol of the milling industry that once flourished along Rock Creek.
		Built in the 1820s by Isaac Peirce, the Mill operated commercially until 1897 when the wooden machinery failed and it was no longer economically feasible to produce flour on Rock Creek.
		Repairs were carried out in the 60s and again in the 70s to keep the mill operating but finally, in April 1993, the wooden waterwheel shaft failed and the machinery has not turned since then.
	www.peircemill-friends.org /index.html (271 words)

	[No title]
		The mass of rock moving in or moved by a rockfall; a mass of fallen
		The movement of solid rock when it is in a plastic state.
		The resistance of the rock to the intrusion of a foreign body.
	www.maden.hacettepe.edu.tr /dmmrt/dmmrt997.html (524 words)

	NDP-043C (Appendix B)
		SERPENTINITE (150) - Green to greenish-yellow rock composed chiefly of the mineral serpentine, derived from metamorphism of iron-magnesium-rich igneous rocks.
		Typically composed of quartz, feldspars, and rock fragments, which are cemented together by silica, calcite, iron oxide, or clay.
		The hardness or strength of this rock depends largely on the nature and extent of the cement.
	cdiac.esd.ornl.gov /epubs/ndp/ndp043c/appendb.htm (1741 words)

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