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Chalacot
Chalacot or Chelekot is a village in the Tigray Region of Ethiopia. Located in the Enderta woreda (district) of the Debub Misraqawi (Southeastern) Zone, 10 kilometers north of Antalo and 17 kilometers south of Mek'ele, the village has an approximate elevation of 2100 meters above sea level. The Central Statistical Agency has not published an estimate for this village's 2005 population. Geology and soils The following geological formations are present in this locality: * Amba Aradam Formation * Agula Shale * Mekelle Dolerite * Antalo Limestone * Quaternary alluvium and freshwater tufa The main geomorphic units, with corresponding soil types are: * Gently rolling Antalo Limestone plateau, holding cliffs and valley bottoms on limestone ** Associated soil types *** shallow stony soils with a dark surface horizon overlying calcaric material (Calcaric Leptosol) *** moderately deep dark stony clays with good natural fertility (Vertic Cambisol) *** deep, dark cracking clays on calcar ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tufa Dam In Chelekwot
Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine. Tufa is sometimes referred to as (meteogene) travertine. It should not be confused with hot spring (thermogene) travertine. Tufa, which is calcareous, should also not be confused with tuff, a porous volcanic rock with a similar etymology that is sometimes also called "tufa". Classification and features Modern and fossil tufa deposits abound with wetland plants; as such, many tufa deposits are characterised by their large macrobiological component, and are highly porous. Tufa forms either in fluvial channels or in lacustrine environments. Ford and Pedley (1996) provide a review of tufa systems worldwide. Fluvial deposits Deposits can be classified by their depositional environment (or otherwise by vegetation or petrographically). Pedle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tufa
Tufa is a variety of limestone formed when carbonate minerals precipitate out of water in unheated rivers or lakes. Geothermally heated hot springs sometimes produce similar (but less porous) carbonate deposits, which are known as travertine. Tufa is sometimes referred to as (meteogene) travertine. It should not be confused with hot spring (thermogene) travertine. Tufa, which is calcareous, should also not be confused with tuff, a porous volcanic rock with a similar etymology that is sometimes also called "tufa". Classification and features Modern and fossil tufa deposits abound with wetland plants; as such, many tufa deposits are characterised by their large macrobiological component, and are highly porous. Tufa forms either in fluvial channels or in lacustrine environments. Ford and Pedley (1996) provide a review of tufa systems worldwide. Fluvial deposits Deposits can be classified by their depositional environment (or otherwise by vegetation or petrographically). Pedle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Enderta (woreda)
Enderta () is one of the Districts of Ethiopia or ''woredas'' in the Tigray Region of Ethiopia. It was named for the former Enderta province, which was later merged into Tigray Province. Located in the Debub Misraqawi (Southeastern) Zone at the eastern edge of the Ethiopian highlands Enderta is bordered on the south by Hintalo Wajirat, on the west by Samre, on the northwest by the Mehakelegnaw (Central) Zone, on the north by the Misraqawi (Eastern) Zone, and on the east by the Afar Region; the city and special zone of Mek'ele is an enclave within Enderta. Towns in Enderta include Aynalem and Qwiha; the historic village of Chalacot is also located in this woreda. At least one monolithic church is located in this woreda: a dedication to Mikael in the village of Zahero, which lies in the eastern part. Demographics Based on the 2007 national census conducted by the Central Statistical Agency of Ethiopia (CSA), this woreda has a total population of 114,297, an increase of 8 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wolde Selassie
Wolde Selassie (; c.1736 - 28 May 1816) was Ras of the Tigray province between 1788-1816, and Regent of the Ethiopian Empire between 1797-1800. John J. Halls, in his ''Life and Correspondence of Henry Salt'', preserves a description of this powerful warlord, as "small in stature, and delicately formed, quick in his manner, with a shrewd expression, and considerable dignity in his deportment." Nathaniel Pearce also notes that Ras Wolde was an avid chess player, and "would play at from morning till night". Life Wolde Selassie, who descended from the nobility of Antalo in Enderta, emerged as the ruler of Tigray, Hamasien and Mareb Melash (Eritrea) after years of fighting; Nathaniel Pearce describes an encounter where he made a name for himself by single-handedly slaying the brothers Abel and Cail, "two of Ras Michael's choice men" who were sent by Michael to kill Wolde Selasse. Despite the fact ''Ras'' Mikael Sehul was so impressed at this act of bravery that he tried to make pea ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fluvisol
A fluvisol in the World Reference Base for Soil Resources (WRB) is a genetically young soil in alluvial deposits . Apart from river sediments, they also occur in lacustrine and marine deposits. Fluvisols correlate with fluvents and fluvaquents of the USDA soil taxonomy. The good natural fertility of most fluvisols and their attractive dwelling sites on river levees and higher parts in marine landscapes were recognized in prehistoric times. Fluvisols are found on alluvial plains, river fans, valleys and tidal marshes on all continents and in all climate zones. Under natural conditions periodical flooding is fairly common. The soils have a clear evidence of stratification. Soil horizons are weakly developed, but a distinct topsoil horizon may be present. Many dryland crops are grown on fluvisols, normally with some form of water control. On tropical Fluvisols with satisfactory irrigation and drainage paddy rice cultivation is widespread. Some coastal lowlands have fluvisols wit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Loam
Loam (in geology and soil science) is soil composed mostly of sand (particle size > ), silt (particle size > ), and a smaller amount of clay (particle size < ). By weight, its mineral composition is about 40–40–20% concentration of sand–silt–clay, respectively. These proportions can vary to a degree, however, and result in different types of loam soils: sandy loam, silty loam, clay loam, sandy clay loam, silty clay loam, and loam. In the , textural classification triangle, the only soil that is not predominantly sand, silt, or clay is called "loam". Loam soils generally contain more nutrients, moisture, and |
Waterlogging (agriculture)
Waterlogging water is the saturation of soil with water. Soil may be regarded as waterlogged when it is nearly saturated with water much of the time such that its air phase is restricted and anaerobic conditions prevail. In extreme cases of prolonged waterlogging, anaerobiosis occurs, the roots of mesophytes suffer, and the subsurface reducing atmosphere leads to such processes as denitrification, methanogenesis, and the reduction of iron and manganese oxides. All plants, including crops require air (specifically, oxygen) to respire, produce energy and keep their cells alive. In agriculture, waterlogging of the soil typically blocks air from getting in to the roots. With the exception of rice (''Oryza sativa''), most crops like maize and potato, are therefore highly intolerant to waterlogging. Plant cells use a variety of signals such the oxygen concentration, plant hormones like ethylene, energy and sugar status to acclimate to waterlogging-induced oxygen deprivation. In ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sand
Sand is a granular material composed of finely divided mineral particles. Sand has various compositions but is defined by its grain size. Sand grains are smaller than gravel and coarser than silt. Sand can also refer to a textural class of soil or soil type; i.e., a soil containing more than 85 percent sand-sized particles by mass. The composition of sand varies, depending on the local rock sources and conditions, but the most common constituent of sand in inland continental settings and non-tropical coastal settings is silica (silicon dioxide, or SiO2), usually in the form of quartz. Calcium carbonate is the second most common type of sand, for example, aragonite, which has mostly been created, over the past 500million years, by various forms of life, like coral and shellfish. For example, it is the primary form of sand apparent in areas where reefs have dominated the ecosystem for millions of years like the Caribbean. Somewhat more rarely, sand may be composed of calciu ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Silt Loam
Loam (in geology and soil science) is soil composed mostly of sand (particle size > ), silt (particle size > ), and a smaller amount of clay (particle size < ). By weight, its mineral composition is about 40–40–20% concentration of sand–silt–clay, respectively. These proportions can vary to a degree, however, and result in different types of loam soils: sandy loam, silty loam, clay loam, sandy clay loam, silty clay loam, and loam. In the , textural classification triangle, the only soil that is not predominantly sand, silt, or clay is called "loam". Loam soils generally contain more nutrients, moisture, and |
Ethiopia
Ethiopia, , om, Itiyoophiyaa, so, Itoobiya, ti, ኢትዮጵያ, Ítiyop'iya, aa, Itiyoppiya officially the Federal Democratic Republic of Ethiopia, is a landlocked country in the Horn of Africa. It shares borders with Eritrea to the north, Djibouti to the northeast, Somalia to the east and northeast, Kenya to the south, South Sudan to the west, and Sudan to the northwest. Ethiopia has a total area of . As of 2022, it is home to around 113.5 million inhabitants, making it the 13th-most populous country in the world and the 2nd-most populous in Africa after Nigeria. The national capital and largest city, Addis Ababa, lies several kilometres west of the East African Rift that splits the country into the African and Somali tectonic plates. Anatomically modern humans emerged from modern-day Ethiopia and set out to the Near East and elsewhere in the Middle Paleolithic period. Southwestern Ethiopia has been proposed as a possible homeland of the Afroasiatic langua ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tekle Giyorgis I Of Ethiopia
Tekle Giyorgis I ( gez, ተክለ ጊዮርጊስ; c. 1751 – 12 December 1817), throne name Feqr Sagad, was Emperor of Ethiopia intermittently between 20 July 1779 and June 1800, and a member of the Solomonic dynasty. He was the youngest son of Yohannes II and Woizoro Sancheviyer, and the brother of Tekle Haymanot II. According to Sven Rubenson, who described Tekle Giyorgis as the last emperor to exercise authority on his own, "It is not without justification that he has in Ethiopian tradition received the nickname ''Fiṣame Mengist'', 'the end of the government'". Tekle held multiple separated reigns due to quarrels against his rivals for the crown, he continually pursued to restore himself to the throne in his later life. Physical description Nathaniel Pearce, who lived in Ethiopia during the 1810s, was acquainted with Tekle Giyorgis and described the emperor, at age 66, as : "tall, and stout in proportion, always wears his hair long and plaited; has large eyes, a Roman nose ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cambisol
A Cambisol in the World Reference Base for Soil Resources (WRB) is a soil in the beginning of soil formation. The horizon differentiation is weak. This is evident from weak, mostly brownish discolouration and/or structure formation in the soil profile. Cambisols are developed in medium and fine-textured materials derived from a wide range of rocks, mostly in alluvial, colluvial and aeolian deposits. Most of these soils make good agricultural land and are intensively used. Cambisols in temperate climates are among the most productive soils on earth. Cambisols cover an estimated 15 million square kilometres worldwide. They are well represented in temperate and boreal regions that were under the influence of glaciation during the Pleistocene, partly because the soil's parent material is still young, but also because soil formation is comparatively slow in the cool, northern regions. Cambisols are less common in the tropics and subtropics, but they are common in areas with active ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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