Granite is a common type of felsic intrusive igneous rock, granular and phaneritic in texture. Granites can be predominantly white, pink, or gray depending on their mineralogy; the word "granite" comes from the Latin granum, a grain, in reference to the coarse-grained structure of such a holocrystalline rock. Speaking, granite is an igneous rock with between 20% and 60% quartz by volume, at least 35% of the total feldspar consisting of alkali feldspar, although the term "granite" is used to refer to a wider range of coarse-grained igneous rocks containing quartz and feldspar; the term "granitic" means granite-like and is applied to granite and a group of intrusive igneous rocks with similar textures and slight variations in composition and origin. These rocks consist of feldspar, quartz and amphibole minerals, which form an interlocking, somewhat equigranular matrix of feldspar and quartz with scattered darker biotite mica and amphibole peppering the lighter color minerals; some individual crystals are larger than the groundmass, in which case the texture is known as porphyritic.
A granitic rock with a porphyritic texture is known as a granite porphyry. Granitoid is a descriptive field term for lighter-colored, coarse-grained igneous rocks. Petrographic examination is required for identification of specific types of granitoids; the extrusive igneous rock equivalent of granite is rhyolite. Granite is nearly always massive and tough; these properties have made granite a widespread construction stone throughout human history. The average density of granite is between 2.65 and 2.75 g/cm3, its compressive strength lies above 200 MPa, its viscosity near STP is 3–6·1019 Pa·s. The melting temperature of dry granite at ambient pressure is 1215–1260 °C. Granite has poor primary permeability overall, but strong secondary permeability through cracks and fractures if they are present. Granite is classified according to the QAPF diagram for coarse grained plutonic rocks and is named according to the percentage of quartz, alkali feldspar and plagioclase feldspar on the A-Q-P half of the diagram.
True granite contains both alkali feldspars. When a granitoid is devoid or nearly devoid of plagioclase, the rock is referred to as alkali feldspar granite; when a granitoid contains less than 10% orthoclase, it is called tonalite. A granite containing both muscovite and biotite micas is called two-mica granite. Two-mica granites are high in potassium and low in plagioclase, are S-type granites or A-type granites. A worldwide average of the chemical composition of granite, by weight percent, based on 2485 analyses: Granite containing rock is distributed throughout the continental crust. Much of it was intruded during the Precambrian age. Outcrops of granite tend to form rounded massifs. Granites sometimes occur in circular depressions surrounded by a range of hills, formed by the metamorphic aureole or hornfels. Granite occurs as small, less than 100 km2 stock masses and in batholiths that are associated with orogenic mountain ranges. Small dikes of granitic composition called aplites are associated with the margins of granitic intrusions.
In some locations coarse-grained pegmatite masses occur with granite. Granite is more common in continental crust than in oceanic crust, they are crystallized from felsic melts which are less dense than mafic rocks and thus tend to ascend toward the surface. In contrast, mafic rocks, either basalts or gabbros, once metamorphosed at eclogite facies, tend to sink into the mantle beneath the Moho. Granitoids have crystallized from felsic magmas that have compositions near a eutectic point. Magmas are composed of minerals in variable abundances. Traditionally, magmatic minerals are crystallized from the melts that have separated from their parental rocks and thus are evolved because of igneous differentiation. If a granite has a cooling process, it has the potential to form larger crystals. There are peritectic and residual minerals in granitic magmas. Peritectic minerals are generated through peritectic reactions, whereas residual minerals are inherited from parental rocks. In either case, magmas will evolve to the eutectic for crystallization upon cooling.
Anatectic melts are produced by peritectic reactions, but they are much less evolved than magmatic melts because they have not separated from their parental rocks. The composition of anatectic melts may change toward the magmatic melts through high-degree fractional crystallization. Fractional crystallisation serves to reduce a melt in iron, titanium and sodium, enrich the melt in potassium and silicon – alkali feldspar and quartz, are two of the defining constituents of granite; this process operates regardless of the origin of parental magmas to granites, regardless of their chemistry. The composition and origin of any magma that differentiates into granite leave certain petrological evidence as to what the granite's parental rock was; the final texture and composition of a granite are distinctive as to its parental rock. For instance, a granite, derived from partial melting of meta
A reflecting pool or reflection pool is a water feature found in gardens, at memorial sites. It consists of a shallow pool of water, undisturbed by fountain jets, for a reflective head Reflecting pools are designed with the outer basin floor at the rim deeper than the central area to suppress wave formation, they can be as small as a bird bath to as large as a major civic element. Their origins are from ancient Persian gardens; the Miroir d'eau on Place de la Bourse in Bordeaux, France, is the world's largest reflecting pool. The Mughal garden reflecting pools at the Taj Mahal in Agra, India Chehel Sotoun in Iran The Lincoln Memorial Reflecting Pool, Capitol Reflecting Pool, in Washington, D. C; the modernist Palácio do Planalto and Palácio da Alvorada in Brasília, Brazil The King Center in Atlanta, Georgia commemorating Dr. Martin Luther King, Jr; the Oklahoma City National Memorial, at the site of the Oklahoma City bombing The Hollywood Bowl in Los Angeles, California, a former reflecting pool was located in front of the stage, circa 1953 - 1972.
The National September 11 Memorial & Museum, located in New York City, has two reflecting pools on the location where the Twin Towers stood
Place de la Bourse
Place de la Bourse is a square in Bordeaux and one of the city's most recognisable sights. Built from 1730 to 1775 along the Garonne River, it was a multi-building development designed by architect Ange-Jacques Gabriel, it is within the historic part of the city, recognized on the UNESCO World Heritage List as "an outstanding urban and architectural ensemble" of the 18th century. In the original plan, a statue of King Louis XV of France was erected in the square; this statue was destroyed during the French Revolution. After the destruction of the statue, a Corinthian column-fountain was built on the square. In 1869 the sculpture Three Graces was installed in the same location. Design of the surrounding buildings was finished by Ange-Jacques Gabriel in 1739. After his death, his son finished the construction of the buildings; this square is one of the most representative works of classical French architectural art of the eighteenth century. In the north stood the Palais de la Bourse and in the south the Hotel des Fermes.
It was designed by Ange-Jacques Gabriel between 1735 and 1738. The sculptures represent Minerve protecting Mercury favoring the commerce of the city. In 2007 it was included on the UNESCO World Heritage List as "an outstanding urban and architectural ensemble" of the 18th century
The Garonne is a river in southwest France and northern Spain, with a length of 602 kilometres. It flows into the Atlantic Ocean at Bordeaux; the name derives from Garumna, a Latinized version of the Aquitanian name meaning "stony river". The Garonne's headwaters are to be found in the Aran Valley in the Spanish Pyrenees, though three different locations have been proposed as the true source: the Uelh deth Garona at Plan de Beret, the Ratera-Saboredo cirque 42°36′26″N 0°57′56″E), or the slopes of Pic Aneto; the Uelh deth Garona at 1,862 metres above sea level has been traditionally considered as the source of the Garonne. From this point a brook runs for 2.5 kilometres until the bed of the main upper Garonne valley. The river runs for another 38 kilometres until the French border at Pont de Rei, 40.5 kilometres in total. The Ratera-Saboredo cirque is the head of the upper Garonne valley, its upper lake at 2,600 metres above sea level is the origin of the Ruda-Garona river, running for 16 kilometres until the confluence with the Beret-Garona brook, another 38 kilometres until the French border at Pont del Rei, 54 kilometres in total.
At the confluence, the Ruda-Garona carries 2.6 cubic metres per second of water. The Ratera-Saboredo cirque has been pointed by many researchers as the origin of the Garonne; the third thesis holds that the river rises on the slopes of Pic Aneto at 2,300 metres above sea level and flows by way of a sinkhole known as the Forau de Aigualluts through the limestone of the Tuca Blanca de Pomèro and a resurgence in the Val dera Artiga above the Aran Valley in the Spanish Pyrenees. This underground route was suggested by the geologist Ramond de Carbonnières in 1787, but there was no confirmation until 1931, when caver Norbert Casteret poured fluorescein dye into the flow and noted its emergence a few hours 4 kilometres away at Uelhs deth Joèu in the Artiga de Lin on the other side of the mountain. From Aigualluts to the confluence with the main river at the bed of the upper Garonne valley at 800 metres above sea level, the Joèu has run for 12.4 kilometres, carrying 2.16 cubic metres per second of water, while the main river is carrying 17.7 cubic metres per second.
Despite the lack of universal agreement upon definition for determining a stream's source, the United States Geological Survey, the National Geographic Society, the Smithsonian Institution agree that a stream's source should be considered as the most distant point in the drainage basin from which water runs. The Ratera-Saboredo cirque is the "most distant point in the drainage basin from which water runs", the source of the Garonne, according to the United States Geological Survey, the National Geographic Society, the Smithsonian Institution convention upon determining a stream's source; the Garonne follows the Aran Valley northwards into France, flowing via Toulouse and Agen towards Bordeaux, where it meets the Gironde estuary. The Gironde flows into the Atlantic Ocean. Along its course, the Garonne is joined by three other major rivers: the Ariège, the Tarn, the Lot. Just after Bordeaux, the Garonne meets the Dordogne at the Bec d'Ambès, forming the Gironde estuary, which after 100 kilometres empties into the Atlantic Ocean.
Other tributaries include the Gers. The Garonne is one of the few rivers in the world. Surfers and jet skiers could ride the tidal bore at least as far as the village of Cambes, 120 kilometres or 75 miles from the Atlantic, further upstream to Cadillac, although the tidal bore appears and disappears in response to changes in the channel bathymetry. In 2010 and 2012, some detailed field studies were conducted in the Garonne's Arcins channel between Arcins Island and the right bank close to Lastrene township. A striking feature of the field data sets was the large and rapid fluctuations in turbulent velocities and turbulent stresses during the tidal bore and flood flow; the European sea sturgeon known as the Atlantic sturgeon or common sturgeon, is now a Critically Endangered species status. This species of sturgeon that can reach a length of 6 m and weigh 400 kg and can reach an age of 100 year Previously found on most coasts of Europe, it has now become so rare that they ONLY breed in the Garonne river basin in France.
Conservation projects are under way to save this fish from extinction with species reintroduction from aquaculture with the first releases being made in 1995. Aran Valley: Vielha, Bossòst Haute-Garonne: Saint-Gaudens, Toulouse Tarn-et-Garonne: Castelsarrasin Lot-et-Garonne: Agen, Aiguillon Gironde: Langon, Bordeaux Following the flow of the river: The Garonne plays an important role in inland shipping; the river not only allows seagoing vessels to reach the port of Bordeaux but forms part of the Canal des Deux Mers, linking the Mediterranean Sea and the Atlantic Ocean. From the ocean, ships pass through the Gironde estuary up to the mouth of the Garonne. Ships continue on the tidal river Garonne up to the Pont de Pierre in Bordeaux. Inland vessels continue upstream to Castets-en-Dor
Bordeaux is a port city on the Garonne in the Gironde department in Southwestern France. The municipality of Bordeaux proper has a population of 252,040. Together with its suburbs and satellite towns, Bordeaux is the centre of the Bordeaux Métropole. With 1,195,335 in the metropolitan area, it is the sixth-largest in France, after Paris, Lyon and Lille, it is the capital of the Nouvelle-Aquitaine region, as well as the prefecture of the Gironde department. Its inhabitants are called "Bordelais" or "Bordelaises"; the term "Bordelais" may refer to the city and its surrounding region. Being at the center of a major wine-growing and wine-producing region, Bordeaux remains a prominent powerhouse and exercises significant influence on the world wine industry although no wine production is conducted within the city limits, it is home to the world's main wine fair and the wine economy in the metro area takes in 14.5 billion euros each year. Bordeaux wine has been produced in the region since the 8th century.
The historic part of the city is on the UNESCO World Heritage List as "an outstanding urban and architectural ensemble" of the 18th century. After Paris, Bordeaux has the highest number of preserved historical buildings of any city in France. In historical times, around 567 BC it was the settlement of a Celtic tribe, the Bituriges Vivisci, who named the town Burdigala of Aquitanian origin; the name Bourde is still the name of a river south of the city. In 107 BC, the Battle of Burdigala was fought by the Romans who were defending the Allobroges, a Gallic tribe allied to Rome, the Tigurini led by Divico; the Romans were defeated and their commander, the consul Lucius Cassius Longinus, was killed in the action. The city fell under Roman rule around its importance lying in the commerce of tin and lead, it became capital of Roman Aquitaine, flourishing during the Severan dynasty. In 276 it was sacked by the Vandals. Further ravage was brought by the same Vandals in 409, the Visigoths in 414, the Franks in 498, beginning a period of obscurity for the city.
In the late 6th century, the city re-emerged as the seat of a county and an archdiocese within the Merovingian kingdom of the Franks, but royal Frankish power was never strong. The city started to play a regional role as a major urban center on the fringes of the newly founded Frankish Duchy of Vasconia. Around 585, Gallactorius is fighting the Basque people; the city was plundered by the troops of Abd er Rahman in 732 after they stormed the fortified city and overwhelmed the Aquitanian garrison. Duke Eudes mustered a force ready to engage the Umayyads outside Bordeaux taking them on in the Battle of the River Garonne somewhere near the river Dordogne; the battle had a high death toll. Although Eudes was defeated here, he saved part of his troops and kept his grip on Aquitaine after the Battle of Poitiers. In 735, the Aquitanian duke Hunald led a rebellion after his father Eudes's death, at which Charles responded by sending an expedition that captured and plundered Bordeaux again, but did not retain it for long.
The following year, the Frankish commander descended again to Aquitaine, but clashed in battle with the Aquitanians and left to take on hostile Burgundian authorities and magnates. In 745, Aquitaine faced yet another expedition by Charles's sons Pepin and Carloman, against Hunald, the Aquitanian princeps strong in Bordeaux. Hunald was defeated, his son Waifer replaced him, confirmed Bordeaux as the capital city. During the last stage of the war against Aquitaine, it was one of Waifer's last important strongholds to fall to King Pepin the Short's troops. Next to Bordeaux, Charlemagne built the fortress of Fronsac on a hill across the border with the Basques, where Basque commanders came over to vow loyalty to him. In 778, Seguin was appointed count of Bordeaux undermining the power of the Duke Lupo, leading to the Battle of Roncevaux Pass that year. In 814, Seguin was made Duke of Vasconia, but he was deposed in 816 for failing to suppress or sympathise with a Basque rebellion. Under the Carolingians, sometimes the Counts of Bordeaux held the title concomitantly with that of Duke of Vasconia.
They were meant to keep the Basques in check and defend the mouth of the Garonne from the Vikings when the latter appeared c. 844 in the region of Bordeaux. In Autumn 845, count Seguin II marched on the Vikings, who were assaulting Bordeaux and Saintes, but he was captured and executed. No bishops were mentioned during part of the 9th in Bordeaux. From the 12th to the 15th century, Bordeaux regained importance following the marriage of Duchess Eléonore of Aquitaine with the French-speaking Count Henri Plantagenet, born in Le Mans, who became, within months of their wedding, King Henry II of England; the city flourished due to the wine trade, the cathedral of St. André was built, it was the capital of an independent state under Edward, the Black Prince, but in the end, after the Battle of Castillon, it was annexed by France which extended its territory. The Château Trompette and the Fort du Hâ, built by Charles VII of France, were the symbols of the new domination, which however deprived the city of its wealth by halting the wine commerce with England.
In 1462, Bordeaux obtained a parliament, but regained importance only in the 16th century when it became the centre of the distribution of sugar and slaves from the West Indies along with the traditional wine. Bordeaux adhered to the Fronde