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Ravine (other)
A ravine is a landform that is narrower than a canyon and is often the product of streambank erosion. Ravines are typically classified as larger in scale than gully, gullies, although smaller than valleys. Ravines may also be called a cleuch, dell, ghout (Nevis), Gill (ravine), gill or ghyll, glen, gorge, kloof (South Africa), and chine (Isle of Wight) A ravine is generally a fluvial slope landform of relatively steep (cross-sectional) sides, on the order of twenty to seventy percent in Grade (slope), gradient. Ravines may or may not have active streams flowing along the downslope channel which originally formed them; moreover, often they are characterized by intermittent streams, since their geographic scale may not be sufficiently large to support a perennial stream. Definition According to Merriam-Webster, a ravine is "a small, narrow, steep-sided valley that is larger than a gully and smaller than a canyon and that is usually worn by running water". Some societies and languag ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Merriam-Webster
Merriam-Webster, Inc. is an American company that publishes reference books and is especially known for its dictionaries. It is the oldest dictionary publisher in the United States. In 1831, George and Charles Merriam founded the company as G & C Merriam Co. in Springfield, Massachusetts. In 1843, after Noah Webster died, the company bought the rights to '' An American Dictionary of the English Language'' from Webster's estate. All Merriam-Webster dictionaries trace their lineage to this source. In 1964, Encyclopædia Britannica, Inc. acquired Merriam-Webster, Inc. as a subsidiary. The company adopted its current name in 1982. History Noah Webster In 1806, Webster published his first dictionary, ''A Compendious Dictionary of the English Language''. In 1807 Webster started two decades of intensive work to expand his publication into a fully comprehensive dictionary, ''An American Dictionary of the English Language''. To help him trace the etymology of words, Webster lea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gravina In Puglia
Gravina in Puglia (; nap, label=Bari dialect, Barese, Gravéine ; la, Silvium; grc, Σιλούϊον, Siloúïon) is a town and ''comune'' of the Metropolitan City of Bari, Apulia, southern Italy. The word ''gravina'' comes from the Latin ''grava'' or from the messapic ''graba'', with the meaning of ''rock'', ''shaft'' and ''erosion of bank river''. Other words that share the same root are ''grava'', ''gravaglione'' and ''gravinelle''. Alternatively, when the emperor Frederick II, Holy Roman Emperor, Frederick II went to Gravina (river), Gravina, because of the large extension of the lands and for the presence of wheat, he decided to give to it the motto ''Grana dat et vina.'', that is to say ''It offers wheat and wine.''. Gravina is the home of the Alta Murgia National Park. History Thanks to its strategic position, Gravina has a very ancient history. Its territory has been inhabited since the Paleolithic, due to the high presence of water and woods. The largest remains date ba ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barranco Del Infierno (Tenerife)
The Barranco del Infierno (in English: "Hell's Gorge") is a ravine located in the town of Adeje in the south of the island of Tenerife, Canary Islands, Spain. It is the second most-visited protected area on the island. A popular hiking trail leads through the ravine to the highest waterfall on Tenerife. Access to the gorge is controlled by a limitation of 300 daily visitors. It is not permitted to under-5s, and under-18s must be accompanied by an adult.Tenerife Top Tours (2020)''Rules'' Consulted 15 January 2023. Reservations can be dononline The trail was closed for security reasons after a deadly accident in 2009 and again on October 26 2015, but was reopened on February 10 2016. The biggest change of all is the compulsory wearing of crash helmets. Currently it is open all the way to the end, except on rainy and windy days, additional safety measures have been implemented. The path takes approximately three and a half hours, between the outward and return journey, and the total ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Barranco De Badajoz
The Barranco de Badajoz or Chamoco is a ravine on the island of Tenerife (Canary Islands, Spain), in the province of Santa Cruz de Tenerife, part of the municipality of Güímar in the southeast of the island.Plan Hidrológico Fuente: Consejo Insular de Aguas de TenerifeInfraestructura de Datos Espaciales de Canarias Fuente: Consejería de Educación, Universidades y Sostenibilidad. Gobierno de Canarias Archeology The most significant prehistoric remains on the island were found in this area, demonstrating the aboriginal |
Bam Bam Amphitheaters
The Bam Bam Amphitheaters are large erosional ravines found in Wonga-Wongue Presidential Reserve in western Gabon. Although they are referred to as "cirques," they are unrelated to the glacial cirques of high latitudes and mountains. In Gabon, they are east-facing slopes cut into the Upper Cretaceous to Paleocene sandstones that dip westward beneath the Atlantic Ocean. Because the sandstones are higher and drier than the surrounding coastal plain, they are covered with grasslands rather than the prevailing tropical rain forest. As the sandstones are locally intensely colored, and because the steep slopes tend to be barren, the "cirques" locally appear to be "badlands Badlands are a type of dry terrain where softer sedimentary rocks and clay-rich soils have been extensively eroded."Badlands" in '' Chambers's Encyclopædia''. London: George Newnes, 1961, Vol. 2, p. 47. They are characterized by steep slopes ..." similar to those of the American West.Horner, R. H., 1985, The G ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Babi Yar
Babi Yar (russian: Ба́бий Яр) or Babyn Yar ( uk, Бабин Яр) is a ravine in the Ukrainian capital Kyiv and a site of massacres carried out by Nazi Germany's forces during its campaign against the Soviet Union in World War II. The first and best documented of the massacres took place on 29–30 September 1941, killing some 33,771 Jews. The decision to murder all the Jews in Kyiv was made by the military governor ''Generalmajor'' Kurt Eberhard, the Police Commander for Army Group South, SS-''Obergruppenführer'' Friedrich Jeckeln, and the ''Einsatzgruppe'' C Commander Otto Rasch. Sonderkommando 4a as the sub-unit of ''Einsatzgruppe'' C, along with the aid of the ''SD'' and Order Police battalions with the Ukrainian Auxiliary Police backed by the ''Wehrmacht'', carried out the orders. Sonderkommando 4a and the 45th Battalion of the German Order Police conducted the shootings. Servicemen of the 303rd Battalion of the German Order Police at this time guarded the oute ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shield Volcanoes
A shield volcano is a type of volcano named for its low profile, resembling a warrior's shield lying on the ground. It is formed by the eruption of highly fluid (low viscosity) lava, which travels farther and forms thinner flows than the more viscous lava erupted from a stratovolcano. Repeated eruptions result in the steady accumulation of broad sheets of lava, building up the shield volcano's distinctive form. Shield volcanoes are found wherever fluid low-silica lava reaches the surface of a rocky planet. However, they are most characteristic of ocean island volcanism associated with hot spots or with continental rift volcanism. They include the largest volcanoes on earth, such as Tamu Massif and Mauna Loa. Giant shield volcanoes are found on other planets of the Solar System, including Olympus Mons on Mars and Sapas Mons on Venus. Etymology The term 'shield volcano' is taken from the German term ''Schildvulkan'', coined by the Austrian geologist Eduard Suess in 1888 and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Badlands
Badlands are a type of dry terrain where softer sedimentary rocks and clay-rich soils have been extensively eroded."Badlands" in '' Chambers's Encyclopædia''. London: George Newnes, 1961, Vol. 2, p. 47. They are characterized by steep slopes, minimal vegetation, lack of a substantial regolith, and high drainage density.A.J. Parsons and A.D. Abrahams, Editors (2009) ''Geomorphology of Desert Environments'' (2nd ed.) Springer Science & Business Media Ravines, gullies, buttes, hoodoos and other such geologic forms are common in badlands. Badlands are found on every continent except Antarctica, being most common where there are unconsolidated sediments. They are often difficult to navigate by foot, and are unsuitable for agriculture. Most are a result of natural processes, but destruction of vegetation by overgrazing or pollution can produce anthropogenic badlands. Badlands topography Badlands are characterized by a distinctive badlands topography. This is terrain i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Overgrazing
Overgrazing occurs when plants are exposed to intensive grazing for extended periods of time, or without sufficient recovery periods. It can be caused by either livestock in poorly managed agricultural applications, game reserves, or nature reserves. It can also be caused by immobile, travel restricted populations of native or non-native wild animals. Overgrazing reduces the usefulness, productivity, and biodiversity of the land and is one cause of desertification and erosion. Overgrazing is also seen as a cause of the spread of invasive species of non-native plants and of weeds. Degrading land, emissions from animal agriculture and reducing the biomass in a ecosystem contribute directly to climate change. Overgrazing can be reversed or prevented by removing grazers in order to give plants time to recover between grazing events. Successful planned grazing strategies have been support in the American bison of the Great Plains, or migratory Wildebeests of the Africa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deforestation
Deforestation or forest clearance is the removal of a forest or stand of trees from land that is then land conversion, converted to non-forest use. Deforestation can involve conversion of forest land to farms, ranches, or urban area, urban use. The most concentrated deforestation occurs in tropical rainforests. About 31% of Earth's land surface is covered by forests at present. This is one-third less than the forest cover before the expansion of agriculture, a half of that loss occurring in the last century. Between 15 million to 18 million hectares of forest, an area the size of Bangladesh, are destroyed every year. On average 2,400 trees are cut down each minute. The Food and Agriculture Organization, Food and Agriculture Organization of the United Nations defines deforestation as the conversion of forest to other land uses (regardless of whether it is human-induced). "Deforestation" and "forest area net change" are not the same: the latter is the sum of all forest losses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
