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Mount Pentelikon
Mount Pentelicus or Pentelikon (, or ) is a mountain in Attica, Greece, situated northeast of Athens and southwest of Marathon. Its highest point is the peak ''Pyrgari'', with an elevation of 1,109 m. The mountain is covered in large part with forest (about 60 or 70%), and can be seen from southern Athens (Attica), the Pedia plain, Parnitha, and the southern part of the northern suburbs of Athens. Houses surround the mountain, especially in Vrilissia, Penteli, Ekali, Dionysos, and north of Gerakas. Marble from Mount Pentelicus is of exceptionally high quality and was used to construct much of the Athenian Acropolis. Later, Pentelic marble was exported to Rome, where it was used in construction and in sculptures. In ancient times it was also called Brilessos or Brilettos (, ) which is the origin of the name of the nearby suburb of Vrilissia. Pentelic marble Mount Pentelicus has been famous for its marble since antiquity. Pentelic marble was used for the construction of bui ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Penteli, Greece
Penteli () is a village and a municipality in the North Athens regional unit, Attica, Greece. Belonging to the Athens rural area, it takes its name from Mount Pentelicus. Municipality The municipality Penteli was formed at the 2011 local government reform by the merger of the following 3 former municipalities, that became municipal units: * Melissia * Nea Penteli *Penteli Geography Penteli is situated on the southern slopes of the limestone Penteli mountains. The municipality has an area of 36.064 km2, the municipal unit Penteli 28.878 km2. It is 14 km northeast of central Athens. Some of the neighbourhoods of Penteli are Agia Triada, Agios Dimitrios, Daou and Kallithea. History The bones of prehistoric animals - mastodons, rhinoceros, antelope, and giraffe, along with giant turtles, hyenas and other animals no longer extant in the area - have been found among the limestone crags of the mountain that looms over the present suburb of Athens. The Penteli mountains were reno ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quarry
A quarry is a type of open-pit mining, open-pit mine in which dimension stone, rock (geology), rock, construction aggregate, riprap, sand, gravel, or slate is excavated from the ground. The operation of quarries is regulated in some jurisdictions to manage their safety risks and reduce their environmental impact. The word ''quarry'' can also include the underground quarrying for stone, such as Bath stone. History For thousands of years, only hand tools had been used in quarries. In the eighteenth century, the use of drilling and blasting operations was mastered. Types of rock Types of rock extracted from quarries include: *Chalk *China clay *Scoria, Cinder *Clay *Coal *Construction aggregate (sand and gravel) *Coquina *Diabase *Gabbro *Granite *Gritstone *Gypsum *Limestone *Marble *Ores *Phosphate rock *Quartz *Sandstone *Slate *Travertine Methods of quarrying The method of removal of stones from their natural bed by using different operations is called quarryin ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Keratea
Keratea () is a town in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Lavreotiki, of which it is a municipal unit. The municipal unit has an area of 129.864 km2. It is part of Athens metropolitan area. Geography Keratea is situated in the hills in the southeastern part of the Attica peninsula, 6 km west of the Aegean Sea coast, at about 200 m elevation. It lies at the northern foot of . It is 5 km southeast of Kalyvia Thorikou, 12 km northwest of Lavrio and 29 km southeast of Athens city centre. Greek National Road 89 (Gerakas - Koropi - Lavrio - Sounio) passes through Keratea. In antiquity, the area of present Keratea was part of the deme Cephale, of the phyle Acamantis in Mesogeia area of Ancient Athens. The municipal unit Keratea consists of the town Keratea proper and 62 other settlements, including Kaki Thalassa and Pefka. Historical population The town has historically been an Arvanite settl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Drafi
Drafi () is a residential settlement located in a semi-mountainous slopped region in the municipal unit of Pikermi, in the municipality Rafina–Pikermi, East Attica, Greece. Its population is 2,976 (2021). It is situated east of Athens city center, on the slopes of the Penteliko Mountain. It was initially developed as a housing project for the Agricultural Worker Cooperarative "Pan" . It is bordering Pikermi, Dioni, Penteli, Anthousa and Pallini. Drafi is considered a middle-scale residential area, with many detached houses and luxury mansions. Its developmental stage peaked during 2000-2004, when large scale infrastructure works in East Attica, such as the new international airport in Spata, increased interest for new residences in the wider area. The road network is highly slopped and not fully developed, although Drafi offers a few wider roads than its neighbouring Dioni, such as Achaion St, connecting Drafi with Penteli and Anthousa. Drafi is also well connected towards ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anoixi
Anoixi (, meaning "spring") is a suburb of Athens in East Attica, Greece. Since the 2011 local government reform it is part of the municipality Dionysos, of which it is a municipal unit. The municipal unit has an area of 4.582 km2. Geography Anoixi is situated in the hills in the northeastern part of the Athens conurbation, at about 370 m elevation. It lies east of the Parnitha mountains and northwest of the Penteliko Mountain. It is 1 km south of Agios Stefanos, 9 km west of Marathon and 20 km northeast of Athens city centre. Its built-up area is continuous with those of the neighbouring suburbs Agios Stefanos, Drosia and Stamata. The A1 motorway (Athens - Lamia - Thessaloniki) and the railway from Athens to Thessaloniki pass west of the town. Greek National Road 83 (Athens - Marathon - Rafina) passes through Anoixi. Historical population See also *List of municipalities of Attica A list is a set of discrete items of information collected and se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elgin Marbles
The Elgin Marbles ( ) are a collection of Ancient Greek sculptures from the Parthenon and other structures from the Acropolis of Athens, removed from Ottoman Greece in the early 19th century and shipped to Britain by agents of Thomas Bruce, 7th Earl of Elgin, and now held in the British Museum in London. The majority of the sculptures were created in the 5th century BC under the direction of sculptor and architect Phidias. The term ''Parthenon Marbles'' or ''Parthenon Sculptures'' () refers to sculptures—the Parthenon Frieze, frieze, Metopes of the Parthenon, metopes and Pediments of the Parthenon, pediments—from the Parthenon held in various collections, principally the British Museum and the Acropolis Museum in Athens. From 1801 to 1812, Elgin's agents removed about half the surviving Parthenon sculptures, as well as sculptures from the Erechtheion, the Temple of Athena Nike and the Propylaia (Acropolis of Athens), Propylaia, sending them to Britain in efforts to establ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Δ18O
In geochemistry, paleoclimatology and paleoceanography ''δ''18O or delta-O-18 is a measure of the deviation in ratio of stable isotopes oxygen-18 (18O) and oxygen-16 (16O). It is commonly used as a measure of the temperature of precipitation, as a measure of groundwater/mineral interactions, and as an indicator of processes that show isotopic fractionation, like methanogenesis. In paleosciences, 18O:16O data from corals, foraminifera and ice cores are used as a proxy for temperature. It is defined as the deviation in "per mil" (‰, parts per thousand) between a sample and a standard: :\delta \ce = \left( \frac - 1 \right) \times 1000 ‰ where the standard has a known isotopic composition, such as Vienna Standard Mean Ocean Water (VSMOW). The fractionation can arise from kinetic, equilibrium, or mass-independent fractionation. Mechanism Foraminifera shells are composed of calcium carbonate (CaCO3) and are found in many common geological environments. The rat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Δ13C
In geochemistry, paleoclimatology, and paleoceanography ''δ''13C (pronounced "delta thirteen c") is an isotopic signature, a measure of the ratio of the two stable isotopes of carbon—Carbon-13, 13C and Carbon-12, 12C—reported in parts per thousand (per mil, ‰). The measure is also widely used in archaeology for the reconstruction of past diets, particularly to see if marine foods or certain types of plants were consumed. The definition is, in per mille: :\delta \ce = \left( \frac - 1 \right) \times 1000 where the standard is an established Reference materials for stable isotope analysis, reference material. ''δ''13C varies in time as a function of productivity, the signature of the inorganic source, Oceanic carbon cycle#Burial, organic carbon burial, and vegetation type. Biological processes preferentially take up the lower mass isotope through kinetic fractionation. However some abiotic processes do the same. For example, methane from hydrothermal vents can be depleted ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clasts
Clastic rocks are composed of fragments, or clasts, of pre-existing minerals and rock. A clast is a fragment of geological detritus,Essentials of Geology, 3rd Ed, Stephen Marshak, p. G-3 chunks, and smaller grains of rock broken off other rocks by physical weathering.Essentials of Geology, 3rd Ed, Stephen Marshak, p. G-5 Geologists use the term clastic to refer to sedimentary rocks and particles in sediment transport, whether in suspension or as bed load, and in sediment deposits. Sedimentary clastic rocks Clastic sedimentary rocks are rocks composed predominantly of broken pieces or ''clasts'' of older weathered and eroded rocks. Clastic sediments or sedimentary rocks are classified based on grain size, clast and cementing material (matrix) composition, and texture. The classification factors are often useful in determining a sample's environment of deposition. An example of clastic environment would be a river system in which the full range of grains being transported by ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Accessory Mineral
In geology and mineralogy, a mineral or mineral species is, broadly speaking, a solid substance with a fairly well-defined chemical composition and a specific crystal structure that occurs naturally in pure form.John P. Rafferty, ed. (2011): Minerals'; p. 1. In the series ''Geology: Landforms, Minerals, and Rocks''. Rosen Publishing Group. The Geology, geological definition of mineral normally excludes compounds that occur only in living organisms. However, some minerals are often biogenic (such as calcite) or organic compounds in the sense of chemistry (such as mellite). Moreover, living organisms often synthesize inorganic minerals (such as hydroxylapatite) that also occur in rocks. The concept of mineral is distinct from rock (geology), rock, which is any bulk solid geologic material that is relatively homogeneous at a large enough scale. A rock may consist of one type of mineral or may be an aggregate (geology), aggregate of two or more different types of minerals, spaci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Quartz
Quartz is a hard, crystalline mineral composed of silica (silicon dioxide). The Atom, atoms are linked in a continuous framework of SiO4 silicon–oxygen Tetrahedral molecular geometry, tetrahedra, with each oxygen being shared between two tetrahedra, giving an overall chemical formula of Silicon dioxide, SiO2. Quartz is, therefore, classified structurally as a Silicate mineral#Tectosilicates, framework silicate mineral and compositionally as an oxide mineral. Quartz is the second most abundant mineral in Earth's continental crust, behind feldspar. Quartz exists in two forms, the normal α-quartz and the high-temperature β-quartz, both of which are chiral. The transformation from α-quartz to β-quartz takes place abruptly at . Since the transformation is accompanied by a significant change in volume, it can easily induce microfracturing of ceramics or rocks passing through this temperature threshold. There are many different varieties of quartz, several of which are classifi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calcitic
Calcite is a carbonate mineral and the most stable polymorph of calcium carbonate (CaCO3). It is a very common mineral, particularly as a component of limestone. Calcite defines hardness 3 on the Mohs scale of mineral hardness, based on scratch hardness comparison. Large calcite crystals are used in optical equipment, and limestone composed mostly of calcite has numerous uses. Other polymorphs of calcium carbonate are the minerals aragonite and vaterite. Aragonite will change to calcite over timescales of days or less at temperatures exceeding 300 °C, and vaterite is even less stable. Etymology Calcite is derived from the German , a term from the 19th century that came from the Latin word for lime, (genitive ) with the suffix ''-ite'' used to name minerals. It is thus a doublet of the word ''chalk''. When applied by archaeologists and stone trade professionals, the term alabaster is used not just as in geology and mineralogy, where it is reserved for a variety of g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
