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Edaga Hamus, Ethiopia
Idaga Hamus (also called Edaga Hamus and Sewha Sa'isi'e) is a town in the Saesi Tsaedaemba woreda of Misraqawi Zone of the Tigray Region of Ethiopia. It is located 97 kilometers north of Mekelle on "National Road 1" (now Ethiopian Highway 2), between Freweyni and Adigrat. Geology and soils The following geological formations are present in this locality: * Adigrat Sandstone * Enticho Sandstone The main geomorphic units, with corresponding soil types are: * Enticho Sandstone plateau ** Associated soil types *** shallow sandy soils with an indurated layer which prevents rooting and drainage (Petric Plinthosol) *** moderately deep, (light) brown, loamy to loamy sandy soil (Chromic Cambisol, Arenic Luvisol, Arenic Lixisol) ** Inclusions *** complex of rock outcrops, very stony and very shallow soils ((Lithic) Leptosol) *** shallow, stony, dark greyish brown clay loams and sandy loams (Eutric Regosol and Cambisol) *** clays of floodplains with very high watertable with mod ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Countries Of The World
The following is a list providing an overview of sovereign states around the world with information on their status and recognition of their sovereignty. The 206 listed states can be divided into three categories based on membership within the United Nations System: 193 member states of the United Nations, UN member states, 2 United Nations General Assembly observers#Present non-member observers, UN General Assembly non-member observer states, and 11 other states. The ''sovereignty dispute'' column indicates states having undisputed sovereignty (188 states, of which there are 187 UN member states and 1 UN General Assembly non-member observer state), states having disputed sovereignty (16 states, of which there are 6 UN member states, 1 UN General Assembly non-member observer state, and 9 de facto states), and states having a political status of the Cook Islands and Niue, special political status (2 states, both in associated state, free association with New Zealand). Compi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Luvisol
Luvisols are a group of soils, comprising one of the 32 Reference Soil Groups in the international system of soil classification, the World Reference Base for Soil Resources The World Reference Base for Soil Resources (WRB) is an international soil classification system for naming soils and creating legends for soil maps. The currently valid version is the fourth edition 2022. It is edited by a working group of the Inte ... (WRB). They are widespread, especially in temperate climates, and are generally fertile. Luvisols are widely used for agriculture. Distribution Luvisols cover 500–600 million ha of land area, mainly in the temperate zones. They form on a wide variety of mineral parent materials. In Mediterranean regions, the formation of hematite can produce red-coloured Chromic Luvisols. Description and formation The main characteristic of Luvisols is an argic horizon, a subsurface zone with higher clay content than the material above it. This typically arises as clay is was ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
EEPA
The Europe External Programme with Africa and Europe External Policy Advisors, both called EEPA, are two closely associated Belgian-based non-governmental organizations that aim to encourage the European Union's involvement in human rights in general (EEPA/Advisors) and, in particular, in the Horn of Africa and North Africa (EEPA/Africa). Creation and history ''Europe External Policy Advisors'' (EEPA/Advisors) states that it was created in 2003. It was registered with the European Commission in July 2015 with ID number 719135118053-50, as an international Belgian-based non-governmental organization (AIBSL). ''Europe External Programme with Africa'' (EEPA/Africa) was registered with the European Commission in January 2018 with ID number 574620429651-88. In 2020, the two organisations shared their street address, website and the EEPA acronym. Leadership and structure Mirjam van Reisen, an international relations and human rights professor at Tilburg University, is stated by EEPA/ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tigray War
The Tigray War; ; . was an armed conflict that lasted from 3 November 2020 to 3 November 2022. The war was primarily fought in the Tigray Region of Ethiopia between the Ethiopian federal government and Eritrea on one side, and the Tigray People's Liberation Front (TPLF) on the other. After years of increased tensions and hostilities between the TPLF and the governments of Ethiopia and Eritrea, fighting began when Tigrayan security forces attacked the Northern Command headquarters of the Ethiopian National Defense Force (ENDF), alongside a number of other bases in Tigray. The ENDF counterattacked from the south – while Eritrean Defence Forces (EDF) began launching attacks from the north – which Prime Minister Abiy Ahmed described as "law enforcement operations." Federal allied forces captured Mekelle, the capital of the Tigray Region, on 28 November, after which Abiy declared the operation "over." However, the Tigray government stated soon afterwards that it would continue ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Kingdom Of Aksum
The Kingdom of Aksum ( gez, መንግሥተ አክሱም, ), also known as the Kingdom of Axum or the Aksumite Empire, was a kingdom centered in Northeast Africa and South Arabia from Classical antiquity to the Middle Ages. Based primarily in what is now northern Ethiopia, and spanning modern-day Eritrea, northern Djibouti, and eastern Sudan, it extended at its height into much of modern-day southern Arabia during the reign of King Kaleb. Axum served as the kingdom's capital for many centuries but relocated to Jarma in the 9th century due to declining trade connections and recurring external invasions. Emerging from the earlier Dʿmt civilization, the kingdom was likely founded in the early 1st century. Pre-Aksumite culture developed in part due to a South Arabian influence, evident in the use of the Ancient South Arabian script and the practice of Ancient Semitic religion. However, the Geʽez script came into use by the 4th century, and as the kingdom became a major power on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Vertisol
A vertisol, or vertosol, is a soil type in which there is a high content of expansive clay minerals, many of them known as montmorillonite, that form deep cracks in drier seasons or years. In a phenomenon known as argillipedoturbation, alternate shrinking and swelling causes ''self-ploughing'', where the soil material consistently mixes itself, causing some vertisols to have an extremely deep A horizon and no B horizon. (A soil with no B horizon is called an ''A/C soil''). This heaving of the underlying material to the surface often creates a microrelief known as ''gilgai''. Vertisols typically form from highly basic rocks, such as basalt, in climates that are seasonally humid or subject to erratic droughts and floods, or that impeded drainage. Depending on the parent material and the climate, they can range from grey or red to the more familiar deep black (known as "black earths" in Australia, "black gumbo" in East Texas, "black cotton" soils in East Africa, and "vlei soils" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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] |
Arenosol
In USDA soil taxonomy, a Psamment is defined as an Entisol which consists basically of unconsolidated sand deposits, at pals.iastate.edu often found in shifting sand dunes but also in areas of very coarse- textured parent material subject to millions of years of weathering. This latter case is characteristic of the of northern South America. A Psamment has no distinct soil horizons, and must consist entirely of material of loamy sand or coarser in texture. In the |
Gleysol
A gleysol is a wetland soil (hydric soil) that, unless drained, is saturated with groundwater for long enough to develop a characteristic colour pattern. The pattern is essentially made up of reddish, brownish, or yellowish colours at surfaces of soil particles and/or in the upper soil horizons mixed with greyish/blueish colours inside the peds and/or deeper in the soil. Gleysols are also known as ''Gleyzems'', ''meadow soils'', ''Aqu''-suborders of Entisols, Inceptisols and Mollisols (USDA soil taxonomy), or as ''groundwater soils'' and ''hydro-morphic soils''. Gleysols occur within a wide range of unconsolidated materials, mainly fluvial, marine and lacustrine sediments of Pleistocene or Holocene age, having basic to acidic mineralogy. They are found in depression areas and low landscape positions with shallow groundwater. Wetness is the main limitation on agriculture of virgin gleysols; these are covered with natural swamp vegetation and lie idle or are used for extensive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Watertable
The water table is the upper surface of the zone of saturation. The zone of saturation is where the pores and fractures of the ground are saturated with water. It can also be simply explained as the depth below which the ground is saturated. The water table is the surface where the water pressure head is equal to the atmospheric pressure (where gauge pressure = 0). It may be visualized as the "surface" of the subsurface materials that are saturated with groundwater in a given vicinity. The groundwater may be from precipitation or from groundwater flowing into the aquifer. In areas with sufficient precipitation, water infiltrates through pore spaces in the soil, passing through the unsaturated zone. At increasing depths, water fills in more of the pore spaces in the soils, until a zone of saturation is reached. Below the water table, in the phreatic zone (zone of saturation), layers of permeable rock that yield groundwater are called aquifers. In less permeable soils, such as ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clay
Clay is a type of fine-grained natural soil material containing clay minerals (hydrous aluminium phyllosilicates, e.g. kaolin, Al2 Si2 O5( OH)4). Clays develop plasticity when wet, due to a molecular film of water surrounding the clay particles, but become hard, brittle and non–plastic upon drying or firing. Most pure clay minerals are white or light-coloured, but natural clays show a variety of colours from impurities, such as a reddish or brownish colour from small amounts of iron oxide. Clay is the oldest known ceramic material. Prehistoric humans discovered the useful properties of clay and used it for making pottery. Some of the earliest pottery shards have been dated to around 14,000 BC, and clay tablets were the first known writing medium. Clay is used in many modern industrial processes, such as paper making, cement production, and chemical filtering. Between one-half and two-thirds of the world's population live or work in buildings made with clay, often ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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