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Mining is the extraction of valuable minerals or other geological materials from the Earth, usually from an ore body, lode, vein, seam, reef, or placer deposit.These deposits form a mineralized commodity that is of economic interest to the miner. Ores recovered by mining include metals, coal, oil shale, gemstones, limestone, chalk, dimension stone, rock salt, potash, gravel, and clay.
Asphalt, also known as bitumen (UK: / ˈ b ɪ tj ʊ m ɪ n /, US: / b ɪ ˈ tj uː m ə n, b aɪ-/), is a sticky, black, highly viscous liquid or semi-solid form of petroleum may be found in natural deposits or may be a refined product, and is classed as a pitch fore the 20th century, the term asphaltum was also used. The word is derived from the Ancient Greek ἄσφαλτος ásphaltos.
Originally named fasriger schwerspath by Andreas Gotthelf Schütz in 1791. Renamed schwefelsaurer strontianite aus Pennsylvania by Martin Klaproth in 1797. Renamed by Abraham Gottlieb Werner in 1798 in German zoelestin from the Greek cœlestis for celestial, in allusion to the faint blue color of the original specimen. Renamed Schützit by Dietrich Ludwig Gustav Karsten in 1800.
Walk beside the tall limestone tower, gaze up at its 12-sided lantern as you imagine its beams safely guiding Lake Huron sailors. Pointe-au-Père Lighthouse National Historic Site The Pointe-au-Père navigational aid station, among the most important in Canada, helps us better understand the complexity of the St. Lawrence River and the role ...
substancial - Free ebook download as Text File (.txt), PDF File (.pdf) or read book online for free. contains some random words for machine learning natural language processing
The Marcellus Formation or the Marcellus Shale is a Middle Devonian age unit of sedimentary rock found in eastern North America.Named for a distinctive outcrop near the village of Marcellus, New York, in the United States, it extends throughout much of the Appalachian Basin.. The unit name usage by the U.S. Geological Survey (USGS) includes Marcellus Shale and Marcellus Formation.
Göbekli Tepe (Turkish: [gœbecˈli teˈpe], "Potbelly Hill"; known as Girê Mirazan or Xirabreşkê in Kurdish) is a Neolithic archaeological site near the city of Şanlıurfa in Southeastern Anatolia, Turkey.. The tell or artificial mound has a height of 15 m (50 ft) and is about 300 m (1,000 ft) in diameter, approximately 760 m (2,500 ft) above sea level.
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Name. The name Aachen is a modern descendant, like southern German Ach(e), German: Aach, meaning "river" or "stream", from Old High German ahha, meaning "water" or "stream", which directly translates (and etymologically corresponds) to Latin Aquae, referring to the springs.The location has been inhabited by humans since the Neolithic era, about 5,000 years ago, attracted to its warm mineral ...
The history of the statue of Zeus is quite simple, it has not undergone important changes. Built around 436 BC, it was installed in the temple of Zeus in Olympia and remained there until 395 AD. It was a time when the emperors began to take an interest in the pagan works which had been abandoned at the time of the adoption of Christianity.
Sardinia is the second-largest island in the Mediterranean Sea (after Sicily and before Cyprus), with an area of 24,100 km 2 (9,305 sq mi). It is situated between 38° 51'' and 41° 18'' latitude north (respectively Isola del Toro and Isola La Presa) and 8° 8'' and 9° 50'' east longitude (respectively Capo dell''Argentiera and Capo Comino). To the west of Sardinia is the Sea of Sardinia, a unit ...