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Megadrought
A megadrought (or mega-drought) is a prolonged drought lasting two decades or longer. Past megadroughts have been associated with persistent multiyear La Niña conditions (cooler than normal water temperatures in the tropical eastern Pacific Ocean). The term megadrought is generally used to describe the length of a drought, and not its acute intensity. In scientific literature, the term is used to describe decades-long droughts or multi-decadal droughts. Multi-year droughts of less than a decade, such as the Dust Bowl drought of the 1930s, are generally not described as megadroughts even though they are of a long duration. However, in popular literature, multi-year or even single-year droughts are occasionally described as megadroughts based upon their severity, the economic damage they inflict or other criteria. Impact Megadroughts have historically led to the mass migration of humans away from drought affected lands, resulting in a significant population decline from pre-dro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
California Drought Dry Lakebed 2009
California is a state in the Western United States, located along the Pacific Coast. With nearly 39.2million residents across a total area of approximately , it is the most populous U.S. state and the 3rd largest by area. It is also the most populated subnational entity in North America and the 34th most populous in the world. The Greater Los Angeles area and the San Francisco Bay Area are the nation's second and fifth most populous urban regions respectively, with the former having more than 18.7million residents and the latter having over 9.6million. Sacramento is the state's capital, while Los Angeles is the most populous city in the state and the second most populous city in the country. San Francisco is the second most densely populated major city in the country. Los Angeles County is the country's most populous, while San Bernardino County is the largest county by area in the country. California borders Oregon to the north, Nevada and Arizona to the east, the Mex ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tiwanaku
Tiwanaku ( es, Tiahuanaco or ) is a Pre-Columbian archaeological site in western Bolivia near Lake Titicaca, about 70 kilometers from La Paz, and it is one of the largest sites in South America. Surface remains currently cover around 4 square kilometers and include decorated ceramics, monumental structures, and megalithic blocks. The site's population probably peaked around AD 800 with 10,000 to 20,000 people. The site was first recorded in written history in 1549 by Spanish conquistador Pedro Cieza de León while searching for the southern Inca capital of Qullasuyu. Jesuit chronicler of Peru Bernabé Cobo reported that Tiwanaku's name once was ''taypiqala'', which is Aymara meaning "stone in the center", alluding to the belief that it lay at the center of the world. The name by which Tiwanaku was known to its inhabitants may have been lost as they had no written language. Heggarty and Beresford-Jones suggest that the Puquina language is most likely to have been the language o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ghana
Ghana (; tw, Gaana, ee, Gana), officially the Republic of Ghana, is a country in West Africa. It abuts the Gulf of Guinea and the Atlantic Ocean to the south, sharing borders with Ivory Coast in the west, Burkina Faso in the north, and Togo in the east.Jackson, John G. (2001) ''Introduction to African Civilizations'', Citadel Press, p. 201, . Ghana covers an area of , spanning diverse biomes that range from coastal savannas to tropical rainforests. With nearly 31 million inhabitants (according to 2021 census), Ghana is the second-most populous country in West Africa, after Nigeria. The capital and largest city is Accra; other major cities are Kumasi, Tamale, and Sekondi-Takoradi. The first permanent state in present-day Ghana was the Bono state of the 11th century. Numerous kingdoms and empires emerged over the centuries, of which the most powerful were the Kingdom of Dagbon in the north and the Ashanti Empire in the south. Beginning in the 15th century, the Portuguese Em ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lake Bosumtwi
Lake Bosumtwi is the only natural lake in Ghana. It is situated within an ancient impact crater that is about in diameter. It is about south-east of Kumasi, the capital of Ashanti, and is a popular recreational area. There are about 30 villages near the crater lake of Lake Bosumtwi, with a combined population of about 70,000. The most popular amongst the villages where tourists usually settle is Abono. The Ashanti consider Bosumtwi a sacred lake. According to traditional belief, the souls of the dead come here to bid farewell to the goddess Asase Ya. Because of this, it is considered permissible to fish in the lake only from wooden planks. Among the fish species in the lake is the endemic cichlid '' Hemichromis frempongi'', and the near-endemic cichlids ''Tilapia busumana'' and '' T. discolor''. Impact crater The Lake Bosumtwi impact crater is in diameter, slightly larger than the present lake which is approximately across, and is estimated to be 1.07 million years old ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mono Lake
Mono Lake ( ) is a saline soda lake in Mono County, California, formed at least 760,000 years ago as a terminal lake in an endorheic basin. The lack of an outlet causes high levels of salts to accumulate in the lake which make its water alkaline. The desert lake has an unusually productive ecosystem based on brine shrimp, which thrive in its waters, and provides critical habitat for two million annual migratory birds that feed on the shrimp and alkali flies (''Ephydra hians''). Historically, the native Kutzadika'a people ate the alkali flies' pupae, which live in the shallow waters around the edge of the lake. When the city of Los Angeles diverted water from the freshwater streams flowing into the lake, it lowered the lake level, which imperiled the migratory birds. The Mono Lake Committee formed in response and won a legal battle that forced Los Angeles to partially replenish the lake level. Geology Mono Lake occupies part of the Mono Basin, an endorheic basin tha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radiocarbon Dating
Radiocarbon dating (also referred to as carbon dating or carbon-14 dating) is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon. The method was developed in the late 1940s at the University of Chicago by Willard Libby. It is based on the fact that radiocarbon () is constantly being created in the Earth's atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting combines with atmospheric oxygen to form radioactive carbon dioxide, which is incorporated into plants by photosynthesis; animals then acquire by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of it contains begins to decrease as the undergoes radioactive decay. Measuring the amount of in a sample from a dead plant or animal, such as a piece of wood or a fragment of bone, provides information that can be used to ca ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Christmas Day07 018
Christmas is an annual festival commemorating the birth of Jesus Christ, observed primarily on December 25 as a religious and cultural celebration among billions of people around the world. A feast central to the Christian liturgical year, it is preceded by the season of Advent or the Nativity Fast and initiates the season of Christmastide, which historically in the West lasts twelve days and culminates on Twelfth Night. Christmas Day is a public holiday in many countries, is celebrated religiously by a majority of Christians, as well as culturally by many non-Christians, and forms an integral part of the holiday season organized around it. The traditional Christmas narrative recounted in the New Testament, known as the Nativity of Jesus, says that Jesus was born in Bethlehem, in accordance with messianic prophecies. When Joseph and Mary arrived in the city, the inn had no room and so they were offered a stable where the Christ Child was soon born, with angels proclaiming ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scripps Howard News Service
The E. W. Scripps Company is an American broadcasting company founded in 1878 as a chain of daily newspapers by Edward Willis "E. W." Scripps and his sister, Ellen Browning Scripps. It was also formerly a media conglomerate. The company is headquartered at the Scripps Center in Cincinnati, Ohio. Its corporate motto is "Give light and the people will find their own way", which is symbolized by the media empire's longtime lighthouse logo. In terms of market reach, Scripps is the second largest operator of ABC (which is owned by The Walt Disney Company) affiliates, behind the Sinclair Broadcast Group, and ahead of Hearst Television and Tegna. Scripps also owns a number of free-to-air multi-genre digital subchannel multicast networks through its Scripps Networks subsidiary including the Ion Television network, and Newsy, a national cable news network being converted to free-to-air and streaming presence. History 19th century The E. W. Scripps Company was a newspaper compan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Deseret News
The ''Deseret News'' () is the oldest continuously operating publication in the American west. Its multi-platform products feature journalism and commentary across the fields of politics, culture, family life, faith, sports, and entertainment. The ''Deseret News'' is based in Salt Lake City, Utah and is published by Deseret News Publishing Company, a subsidiary of Deseret Management Corporation, which is owned by the Church of Jesus Christ of Latter-day Saints. The publication's name is from the geographic area of Deseret identified by Utah's pioneer settlers, and much of the publication's reporting is rooted in that region. On January 1, 2021, the newspaper switched from a daily to a weekly print format while continuing to publish daily on the website and Deseret News app. As of 2022, ''Deseret News'' develops daily content for its website and apps in addition to weekly print editions of the Deseret News Local Edition and the Church News. Deseret News publishes 10 editions of D ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Medieval Warm Period
The Medieval Warm Period (MWP), also known as the Medieval Climate Optimum or the Medieval Climatic Anomaly, was a time of warm climate in the North Atlantic region that lasted from to . Climate proxy records show peak warmth occurred at different times for different regions, which indicate that the MWP was not a globally uniform event. Some refer to the MWP as the ''Medieval Climatic Anomaly'' to emphasize that climatic effects other than temperature were also important. The MWP was followed by a regionally cooler period in the North Atlantic and elsewhere, which is sometimes called the Little Ice Age (LIA). Possible causes of the MWP include increased solar activity, decreased volcanic activity, and changes in ocean circulation. Research The Medieval Warm Period (MWP) is generally thought to have occurred from –, during the European Middle Ages. In 1965, Hubert Lamb, one of the first paleoclimatologists, published research based on data from botany, historical document res ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Sahel
The Sahel (; ar, ساحل ' , "coast, shore") is a region in North Africa. It is defined as the ecoclimatic and biogeographic realm of transition between the Sahara to the north and the Sudanian savanna to the south. Having a hot semi-arid climate, it stretches across the south-central latitudes of Northern Africa between the Atlantic Ocean and the Red Sea. The Sahel part of Africa includes – from west to east – parts of northern Senegal, southern Mauritania, central Mali, northern Burkina Faso, the extreme south of Algeria, Niger, the extreme north of Nigeria, Cameroon and Central African Republic, central Chad, central and southern Sudan, the extreme north of South Sudan, Eritrea and Ethiopia. Historically, the western part of the Sahel was sometimes known as the Sudan region (''bilād as-sūdān'' "lands of the Sudan"). This belt was located between the Sahara and the coastal areas of West Africa. There are frequent shortages of food and water due to the dry harsh c ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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