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Well Of Barhout
The Well of Barhout (also nicknamed Well of Hell) is a sink hole in Al-Mahara, Yemen. It has a circular entrance that measures about wide at the surface, and it is deep. Physical features The opening at the top of the Well of Barhout measures across, while the bottom of the sinkhole widens to at the base. The sinkhole is deep and passes through two layers of rock. The top layer is around in thickness. The top layer is porous and permeable and thus allows water to filter down to the second layer which is less permeable, where it flows into the sinkhole, creating four waterfalls each measuring in height. Exploration It was first explored by the Oman Cave Exploration Team (OCET), who reached the bottom on September 15, 2021. Footage provided to Agence France-Presse (AFP) showed cave formations such as stalagmites and grey and lime-green cave pearls, formed by dripping water. The speleologists also report having found snakes, dead animals, and waterfalls in the cave. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al-Mahara
Al Mahrah ( ar, ٱلْمَهْرَة '), or simply Mahra, is a governorate (''muhafazah'') of Yemen in the southern part of the Arabian Peninsula. Situated in the area of the former Mahra Sultanate, its capital is Al Ghaydah, and it has international borders with Saudi Arabia and Oman. Languages and people A sizeable part of the Mahrah population does not speak Arabic as their primary language. Non-Arabic-speakers primarily speak Mehri or Mahri, which is a Modern South Arabian language, similar to the adjacent Dhofar Governorate of Oman. The people that speak Mahri call themselves 'Mahris', and are presumed to be descendants of the ancient people of 'Ad. Geography The geography of Al-Mahrah is similar to that of neighboring Dhofar in Oman. Rigid peaks rising to around , and the Empty Quarter Desert lies to the north. Along its coast near the border with Oman, Al Mahrah is affected by the seasonal monsoon, or Khareef. The mountains become water-soaked and the atmosphere bec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Yemen
Yemen (; ar, ٱلْيَمَن, al-Yaman), officially the Republic of Yemen,, ) is a country in Western Asia. It is situated on the southern end of the Arabian Peninsula, and borders Saudi Arabia to the Saudi Arabia–Yemen border, north and Oman to the Oman–Yemen border, northeast and shares maritime borders with Eritrea, Djibouti, and Somalia. Yemen is the second-largest Arabs, Arab sovereign state in the peninsula, occupying , with a coastline stretching about . Its constitutionally stated Capital city, capital, and largest city, is Sanaa. As of 2021, Yemen has an estimated population of some 30.4 million. In ancient times, Yemen was the home of the Sabaeans, a trading state that included parts of modern-day Ethiopia and Eritrea. Later in 275 AD, the Himyarite Kingdom was influenced by Judaism. Christianity arrived in the fourth century. Islam spread quickly in the seventh century and Yemenite troops were crucial in the early Islamic conquests. Several Dynasty, dynasties ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sink Hole
A sinkhole is a depression or hole in the ground caused by some form of collapse of the surface layer. The term is sometimes used to refer to doline, enclosed depressions that are locally also known as ''vrtače'' and shakeholes, and to openings where surface water enters into underground passages known as ''ponor'', swallow hole or swallet. A ''cenote'' is a type of sinkhole that exposes groundwater underneath. A ''sink'' or ''stream sink'' are more general terms for sites that drain surface water, possibly by infiltration into sediment or crumbled rock. Most sinkholes are caused by karst processes – the chemical dissolution of carbonate rocks, collapse or suffosion processes. Sinkholes are usually circular and vary in size from tens to hundreds of meters both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may form gradually or suddenly, and are found worldwide. Formation Natural processes Sinkholes may capture sur ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Al Mahrah Governorate
Al Mahrah ( ar, ٱلْمَهْرَة '), or simply Mahra, is a governorate ('' muhafazah'') of Yemen in the southern part of the Arabian Peninsula. Situated in the area of the former Mahra Sultanate, its capital is Al Ghaydah, and it has international borders with Saudi Arabia and Oman. Languages and people A sizeable part of the Mahrah population does not speak Arabic as their primary language. Non-Arabic-speakers primarily speak Mehri or Mahri, which is a Modern South Arabian language, similar to the adjacent Dhofar Governorate of Oman. The people that speak Mahri call themselves 'Mahris', and are presumed to be descendants of the ancient people of 'Ad. Geography The geography of Al-Mahrah is similar to that of neighboring Dhofar in Oman. Rigid peaks rising to around , and the Empty Quarter Desert lies to the north. Along its coast near the border with Oman, Al Mahrah is affected by the seasonal monsoon, or Khareef. The mountains become water-soaked and the atmosphere be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Agence France-Presse (AFP)
Agence France-Presse (AFP) is a French international news agency headquartered in Paris, France. Founded in 1835 as Havas, it is the world's oldest news agency. AFP has regional headquarters in Nicosia, Montevideo, Hong Kong and Washington, D.C., and news bureaus in 151 countries in 201 locations. AFP transmits stories, videos, photos and graphics in French, English, Arabic, Portuguese, Spanish, and German. History Agence France-Presse has its origins in the Agence Havas, founded in 1835 in Paris by Charles-Louis Havas, making it the world's oldest news service. The agency pioneered the collection and dissemination of news as a commodity, and had established itself as a fully global concern by the late 19th century. Two Havas employees, Paul Julius Reuter and Bernhard Wolff, set up their own news agencies in London and Berlin respectively. In 1940, when German forces occupied France during World War II, the news agency was taken over by the authorities and renamed "Office f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speleothems
A speleothem (; ) is a geological formation by mineral deposits that accumulate over time in natural caves. Speleothems most commonly form in calcareous caves due to carbonate dissolution reactions. They can take a variety of forms, depending on their depositional history and environment. Their chemical composition, gradual growth, and preservation in caves make them useful paleoclimatic proxies. Chemical and physical characteristics More than 300 variations of cave mineral deposits have been identified. The vast majority of speleothems are calcareous, composed of calcium carbonate (CaCO3) minerals ( calcite or aragonite). Less commonly, speleothems are made of calcium sulfate (gypsum or mirabilite) or opal. Speleothems of pure calcium carbonate or calcium sulfate are translucent and colorless. The presence of iron oxide or copper provides a reddish brown color. The presence of manganese oxide can create darker colors such as black or dark brown. Speleothems can also be brown ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Stalagmites
A stalagmite (, ; from the Greek , from , "dropping, trickling") is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites are typically composed of calcium carbonate, but may consist of lava, mud, peat, pitch, sand, sinter, and amberat (crystallized urine of pack rats). The corresponding formation hanging down from the ceiling of a cave is a stalactite. Mnemonics have been developed for which word refers to which type of formation; one is that ''stalactite'' has a C for "ceiling", and ''stalagmite'' has a G for "ground", another is that, as with ants in the pants, the mites go up and the tights (tites) come down. Formation and type Limestone stalagmites The most common stalagmites are speleothems, which usually form in limestone caves. Stalagmite formation occurs only under certain pH conditions within the cavern. They form through deposition of calcium carbonate an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cave Pearls
A cave or cavern is a natural void in the ground, specifically a space large enough for a human to enter. Caves often form by the weathering of rock and often extend deep underground. The word ''cave'' can refer to smaller openings such as sea caves, rock shelters, and grottos, that extend a relatively short distance into the rock and they are called ''exogene'' caves. Caves which extend further underground than the opening is wide are called ''endogene'' caves. Speleology is the science of exploration and study of all aspects of caves and the cave environment. Visiting or exploring caves for recreation may be called ''caving'', ''potholing'', or ''spelunking''. Formation types The formation and development of caves is known as ''speleogenesis''; it can occur over the course of millions of years. Caves can range widely in size, and are formed by various geological processes. These may involve a combination of chemical processes, erosion by water, tectonic forces, microorgani ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Speleologists
Speleology is the scientific study of caves and other karst features, as well as their make-up, structure, physical properties, history, life forms, and the processes by which they form (speleogenesis) and change over time (speleomorphology). The term ''speleology'' is also sometimes applied to the recreational activity of exploring caves, but this is more properly known as ''caving'', ''potholing'' (British English), or ''spelunking''. Speleology and caving are often connected, as the physical skills required for ''in situ'' study are the same. Speleology is a cross-disciplinary field that combines the knowledge of chemistry, biology, geology, physics, meteorology, and cartography to develop portraits of caves as complex, evolving systems. History Before modern speleology developed, John Beaumont wrote detailed descriptions of some Mendip caves in the 1680s. The term speleology was coined by Émile Rivière in 1890. Prior to the mid-nineteenth century the scientific v ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spelunkers
Caving – also known as spelunking in the United States and Canada and potholing in the United Kingdom and Ireland – is the recreational pastime of exploring wild cave systems (as distinguished from show caves). In contrast, speleology is the scientific study of caves and the cave environment.Caving in New Zealand (from Te Ara: The Encyclopedia of New Zealand, Accessed 2012-11.) The challenges involved in caving vary according to the cave being visited; in addition to the total absence of light beyond the entrance, negotiating pitches, squeezes, [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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