Block and boulder-strewn nubbins and castle koppies apparently evolve through the further weathering, in the subsurface, of incipient bornhardts. |
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I sit in the shade mostly, looking out at the sun, but even so the effect of the open air and reflected sunshine is weathering my skin nicely. |
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Once a year every detail is painted with a thick, clear coat of marine-grade varnish to protect it from weathering. |
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A dynamic model takes into consideration rapid chemical reactions, eg chemical weathering, nutrient uptake and nitrification. |
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True verdigris is actually a coating of cupric carbonate formed by weathering on copper, brass and bronze from age. |
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Aluminum is highly resistant to weathering, even in industrial atmospheres that often corrode other metals. |
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Zeolite is a common product of volcanic glass weathering, but may also be related to opal-CT alteration. |
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Flint Ridge flint forms the cap rock of the Flint Ridge highlands because of its resistance to weathering. |
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When the stone was properly seasoned, the exposed surfaces were case-hardened, creating a finish more resistant to weathering. |
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Rauch experiments with the texture of the earth, often introducing patterns and clay tile string courses to help with weathering. |
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The best part of weathering a storm in Carriacou is the sedating Jack Iron overproof rum. |
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The cherty carbonate rocks are resistant to weathering, and regions underlain by them may stand above the surrounding terrain. |
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After weathering an overnight Pacific storm in Kiakoura, it seemed that our days of endless sunshine were up. |
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Little-weathered grains of hypersthene and rare clasts of limestone persist throughout the profile, as evidence for limited chemical weathering. |
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These climates introduced permafrost and cold-climate weathering products to river systems. |
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The chief sources of phosphorus in river water are the weathering of rocks and the leaching out of fertilizers from agricultural land. |
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After weathering the Asian crisis, the city is fast losing its competitive advantage. |
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Overall, the company is cutting costs and making profits, weathering the difficult economic conditions very well. |
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He was a moderate Islamist who was skilled at weathering the vicissitudes of Somali politics. |
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The UV systems are based on urethane acrylates, which are necessary for excellent weathering properties. |
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The many geometrical variations of bornhardts reflect fracture spacing and the distribution and intensity of weathering. |
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Because they have succumbed to erosion and weathering, perhaps for aeons, these craters are notoriously difficult to spot. |
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They are comprised primarily of a rock called whinstone, which is very prone to vertical weathering and faulting. |
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There was no moderate force ready in the wings capable of weathering the storm. |
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Alteration of the bedrock produces a regolith, the base of which is known as the weathering front. |
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Goethite and lepidocrocite, FeOOH, are common replacement agents of pyrite and also occur as stains on minerals exposed to weathering. |
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Regions typically receive sufficient moisture to enable the physical weathering processes of salt crystal growth and hydration of salts. |
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The clay minerals and copious fines reported suggest that blockfields were produced by chemical weathering in a Mediterranean-type climate. |
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City buildings suffer excessive weathering because of atmospheric pollution. |
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Geologically, the large free-standing pillars are the result of millions of years of weathering. |
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A second category of landforms includes those that relate to the intense cryogenic weathering of exposed bedrock. |
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Low nutrient concentration due to weathering and dilution with water or soil decreases the value of manure. |
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The result is that the stone suffers from the adverse effects of weathering or decay. |
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Over the years it has been shown that some businesses are better at weathering cyclical downturns than others. |
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Recently deposited sediments are unstable mixtures of terrestrial weathering products and organic matter. |
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Because of their resistance to weathering, they accumulate on shale slopes and sometimes form small placer deposits in stream beds. |
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Once magmas erupt or cool beneath the surface, they are subjected to weathering and interaction with descending meteoric waters. |
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Atmospheric deposition, biological activity, and chemical rock weathering control the acid base chemistry of natural waters. |
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When it is exposed to weathering, a thin yellow-green coating of carnotite or tyuyamunite may form on its surface. |
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Most crystals are modified by exsolution, weathering, or metamorphic recrystallization, or they occur in complex intergrowths. |
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In the Australian examples this is due to gilgai, in the Sudanese example to differential compaction of the soil on weathering. |
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Water causes decay or rot of the wood and early failure of paint, and it accelerates the weathering of wood exposed outdoors. |
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Soils are formed by the weathering of parent materials that are deposited or accumulate by geological activity. |
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The hills are the remains of petrified reefs, which resist weathering better than sedimentary limestone. |
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In physical weathering, also known as mechanical weathering or disintegration, physical stresses combine to break rock apart. |
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Breccias are associated with mechanical weathering in regions of high tectonic activity. |
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Rock weathering must have been very different in the early Precambrian because iron is soluble in such water and can easily be transported. |
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The rocks are covered with a black sooty layer of manganese oxides but are quite fresh beneath this weathering crust. |
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Later research was able to involve a greater concentration on, and technical knowledge of, residual deposits and weathering products associated with particular surfaces. |
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How are you weathering that roller coaster, with each and every year the future so up in the air? |
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This mountain illustrates both anticlinal and synclinal folding and the way in which the two different fold types react to weathering and erosion. |
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Mass movements of soils and bedrock erosion in the headwater parts of stream watersheds represent the initial stages of material transport that is made possible by physical weathering. |
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It is thus important to determine the order of magnitude of the acceleration effect on biogenic weathering by soil microorganisms, lichens and vascular plants. |
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In 2011, after weathering criticism from the media, fans, and even his teammates, Beckham finally enjoyed a stellar season. |
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Economics departments are not only weathering the recession, they're diversifying their courses to take advantage of it. |
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Many deserve a medal for weathering these conflicts and never giving up on romantic love. |
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The result of this general decrease in biological activity would have been a decrease in the size of the land carbon reservoir, and a decrease in the rate of chemical rock weathering. |
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Eluvium is the geological term for detritus from weathering rock. |
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The presence of ice on the continents and pack ice on the oceans would inhibit both silicate weathering and photosynthesis, which are the two major sinks for CO 2 at present. |
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The Challenger crew sighted their first iceberg on February 10, 1874, after weathering a storm of such ferocity that the ship was forced to run under treble-reefed topsails. |
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Roundness is increased by abrasion and chemical weathering processes, which blunt particle edges, and decreased by fracturing, which creates new, unworn edges. |
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The cold, dry conditions produce weathering products similar to those observed on Mars, and waters contained within the closed basins are mostly saline. |
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These operations cut or break the residue into smaller pieces, mix soil and residue, and speed winter weathering, thus making the residue more susceptible to decomposition. |
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For pebbles and larger particles, surface textures, such as weathering pits and percussion fractures, provide important clues to particle history. |
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Over thousands to millions of years, the physical breakdown and chemical weathering of volcanic rocks have formed some of the most fertile soils on Earth. |
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A major source of iron, called iron laterite, is a type of residual deposit generated by the intense weathering of iron-rich rocks such as mafic and ultramafic volcanic rocks. |
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Bobby hoisted his one-year-old son, Aidan, into a backpack and went to transfer two pet hawks from their outdoor weathering perch to an indoor mews. |
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She insists her party will not resile from its promise to phase out pokies from pubs and clubs after weathering a fierce campaign and some internal backlash at the state election. |
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The weathering of calcium silicate rocks over millions of years converted the insoluble calcium silicate into soluble calcium salts, which were carried to the oceans. |
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Explaining the shape of gold nuggets has long been a problem, because they have neither the size nor the shape of gold fragments released from bedrock by weathering. |
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The Martian spheroids, when first observed, could have been impact spherules, concretions, ooids, accretionary lapelli, weathering pisoliths, even fossils. |
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A photogeologist uses the different ways in which various rock-types respond to weathering and erosion under the prevailing climatic conditions to distinguish them. |
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Roughly half the soil is non-crystalline material, such as volcanic glass or products from weathering of the glass. |
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The resistance of rock forming minerals to weathering is expressed by Bowen's reaction series. |
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Apathetic, yet curious, he solved the conundrum by facebooking his prey, then weathering the blamestorm. Victory was his. |
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The boulder field is thought to have been caused in part by weathering, such as frost action. |
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And, financial institutions are shrinking assets to bolster capital and improve their chances of weathering the current storm. |
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Granite is very resistant to weathering, while some limestones are very weak. |
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The ice age continues until the reduction in weathering causes an increase in the greenhouse effect. |
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With the exception of wurtzite, all these other minerals were formed by weathering of the primordial zinc sulfides. |
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Restoration work was necessary in 1969 and 1983 due to the effects of weathering on the Portland stone. |
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The sea cliffs and inland tors that are now a feature of the county were those that were resistant to weathering that has taken place since. |
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Large gravel deposits are a common geological feature, being formed as a result of the weathering and erosion of rocks. |
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Volcanic eruptions also provide the benefit of adding nutrients to soil through the weathering process of volcanic rocks. |
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Paralell with volcanism a hilly peneplain formed in northeastern Scania due to weathering and erosion of the basement rocks. |
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In many places weathering of these strata has resulted in the formation of immature calcareous soils. |
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This sediment is often formed when weathering and erosion break down a rock into loose material in a source area. |
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Frost weathering can form cracks in the soil that fill with rubble from above. |
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While this contribution to weathering is usually benign, it can cause problems for artificial stone structures. |
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On the surface of the Earth, water is important in both chemical and physical weathering processes. |
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Nurdles are also created through the physical weathering of larger plastic debris. |
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Such analysis can also be used to follow weathering and degradation of crude spills. |
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Because of this susceptibility to weathering, tombolos are sometimes made more sturdy through the construction of roads or parking lots. |
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Once deposited, physical and chemical weathering can alter the state of preservation. |
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These solvents, usually acidic, migrate through the weathering rock after leaching through upper weathered layers. |
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In addition to the weathering process, some clay minerals are formed through hydrothermal activity. |
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The value is reduced if they have been damaged by weathering or being gnawed by small animals. |
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Most of the eastern coast is characterised by a karst topography, developed from the Adriatic Carbonate Platform's exposure to weathering. |
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Intensive weathering has produced vast areas of eroded stone on the mountain slopes and summits of the northern areas. |
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They are created when ancient granite intrusions are exposed to weathering, as softer rocks surrounding them erode away. |
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During weathering, iron tends to leach from sulfide deposits as the sulfate and from silicate deposits as the bicarbonate. |
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However, it also leaves specimens vulnerable to weathering when exposed to the surface. |
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Bedrock may also experience subsurface weathering at its upper boundary, forming saprolite. |
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The process of nivation follows, whereby a hollow in a slope may be enlarged by ice segregation weathering and glacial erosion. |
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Cliffs are formed as erosion landforms by the processes of weathering and erosion. |
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Cliffs are usually formed by rock that is resistant to weathering and erosion. |
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In course of time, other changes than weathering may overtake tuff deposits. |
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These joints are weaknesses in the rock, which are exploited by agents of both denudation and weathering. |
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Existing joints are subsequently exploited by the action of chemical weathering carbonation to form deep grykes and rounded blocks called clints. |
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Where joints happen to be unusually widely spaced, core blocks can survive and escape above the weathering surface, developing into tors. |
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Saprolites form in the lower zones of soil profiles and represent deep weathering of the bedrock surface. |
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The thick-bedded dolostone's straticulate character was brought out as fine etched parallel grooves on the broken surfaces by weathering. |
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Telogenesis may result from regression, unroofing and the introduction of surface waters or complete exposure and weathering. |
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It is a fine, usually white clay formed by the weathering of aluminous minerals such a feldspar, a plastic clay mineral kaolinite. |
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In addition, changes in Ca, Ba, Rb, Zn, Pb, Co, and other elements in the oldest saprolite indicate element mobility during weathering. |
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Ca is strongly correlated with Mg reflect a common mineralogic sources, may be weathering of amounts of calcite and dolomite. |
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Lowe DJ Controls on the rates of weathering and clay mineral genesis in airfall tephras. |
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The two companies already produce commercial cellulases for the textile industry, for such applications as weathering blue jeans. |
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Fritz S J, Mohr DW Chemical alteration in the micro weathering environment within a spheroidally weathered anorthite boulder. |
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Formulated to offer chemical, temperature, and weathering resistance and high tinting strength, Yellow 2550 has a high level of chromaticity. |
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This proposed condensation reaction may improve the stability of wood against weathering effects. |
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Modifications of heavy mineral assemblages in English coversands by acid pedochemical weathering. |
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For the moment at least, Walker appears to be weathering the controversy. |
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The formation was subject to weathering and digenesis and erosion at the regional unconformity. |
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Lee MR, Parsons I Microtextural controls on weathering of perthitic alkali feldspars. |
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Lee MR, Parsons I Microtextural controls of weathering of perthitic alkali feldspars. |
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Rates and processes of mineral weathering in soils developed on greywackes and shales in the southern uplands of Scotland. |
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Higher magnification revealed sharp-edged phyllosilicate mineral plates common in schist, apparent in samples of prolonged weathering exposure. |
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Aoudjit H, Elsass F, Righi D, Robert D Mica weathering ill acidic soils by analytical electron microscopy. |
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Over millennia clay has accumulated in the subsoils as a result of weathering of primary minerals and clay illuviation. |
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The possible development of mineral phases during the weathering of an iron meteorite is presented in Fig. |
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Fractures and features due to both mechanical and chemical weathering are being mapped on rectified photographs and assembled into photomosaics for each area. |
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Heavy metals occur naturally in soil, normally in low amounts, as result of weathering or other pedogenic processes acting on geological bedrock, where soils develop. |
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Placer materials must be both dense and resistant to weathering processes. |
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Kootenay Lake was and is known for vicious storms that can kick up without any notice, and flat bottom sternwheelers were noted for not weathering them so smoothly. |
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The search for explanations of how mesophytes can survive in the desert brought me to the field of biogenic weathering and climatic changes in the Near East. |
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This aliphatic polyurethane dispersion offers weathering resistance as well as chemical and mechanical resistance for wood joinery and other outdoor applications. |
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Because the present climate can never produce enough weathering to produce oxisols, torrox soils are always paleosols formed during periods of much wetter climates. |
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Furthermore, changes in continental weathering and riverine contributions to the oceans may also be linked with climate, and hydrothermal inputs vary with tectonism. |
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These screes formed as a result of ice and weathering erosion on the rocks of the Borrowdale Volcanic Group, that form the fells to the east of the lake, towards Eskdale. |
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Placer gold comes from the weathering of the primary veins releasing the gold to be transported by water action and concentrated in gravel or sand beds. |
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Chalk has greater resistance to weathering and slumping than the clays with which it is usually associated, thus forming tall steep cliffs where chalk ridges meet the sea. |
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Climatic variations also influence the weathering rate of granites. |
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Chemical weathering of granite occurs when dilute carbonic acid, and other acids present in rain and soil waters, alter feldspar in a process called hydrolysis. |
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Lava flows will also typically show evidence of weathering on their upper surface, whereas sills, if still covered by country rock, typically do not. |
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Although all of the mortar pargings were crazed, the effects of weathering were most apparent in the top pargings and in the top courses of the walls. |
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In this series, quartz is the most stable, followed by feldspar, micas, and finally other less stable minerals that are only present when little weathering has occurred. |
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He argued that the completeness of many finds indicated that transport did not happen, and saw partial individuals and isolated bones as results of weathering and trampling. |
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Life affects climate through its role in the carbon and water cycles and through such mechanisms as albedo, evapotranspiration, cloud formation, and weathering. |
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The final patina is a particularly durable layer that is highly resistant to atmospheric corrosion, thereby protecting the underlying metal against further weathering. |
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Unlike other Scottish cities where sandstone has been used, the buildings are not weathering and need very little structural maintenance on their masonry. |
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Some sandstones are resistant to weathering, yet are easy to work. |
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It is useful for grassland ploughing and sets up the land for weathering by winter frosts, which reduces the time taken to prepare a seedbed for spring sown crops. |
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