1.
Asia
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Asia covers an area of 44,579,000 square kilometres, about 30% of Earths total land area and 8. 7% of the Earths total surface area. The continent, which has long been home to the majority of the population, was the site of many of the first civilizations. Asia is notable for not only its large size and population. In general terms, Asia is bounded on the east by the Pacific Ocean, on the south by the Indian Ocean, the western boundary with Europe is a historical and cultural construct, as there is no clear physical and geographical separation between them. The most commonly accepted boundaries place Asia to the east of the Suez Canal, the Ural River, and the Ural Mountains, and south of the Caucasus Mountains, China and India alternated in being the largest economies in the world from 1 to 1800 A. D. The accidental discovery of America by Columbus in search for India demonstrates this deep fascination, the Silk Road became the main East-West trading route in the Asian hitherland while the Straits of Malacca stood as a major sea route. Asia has exhibited economic dynamism as well as robust population growth during the 20th century, given its size and diversity, the concept of Asia—a name dating back to classical antiquity—may actually have more to do with human geography than physical geography. Asia varies greatly across and within its regions with regard to ethnic groups, cultures, environments, economics, historical ties, the boundary between Asia and Africa is the Red Sea, the Gulf of Suez, and the Suez Canal. This makes Egypt a transcontinental country, with the Sinai peninsula in Asia, the border between Asia and Europe was historically defined by European academics. In Sweden, five years after Peters death, in 1730 Philip Johan von Strahlenberg published a new atlas proposing the Urals as the border of Asia, the Russians were enthusiastic about the concept, which allowed them to keep their European identity in geography. Tatishchev announced that he had proposed the idea to von Strahlenberg, the latter had suggested the Emba River as the lower boundary. Over the next century various proposals were made until the Ural River prevailed in the mid-19th century, the border had been moved perforce from the Black Sea to the Caspian Sea into which the Ural River projects. The border between the Black Sea and the Caspian is usually placed along the crest of the Caucasus Mountains, the border between Asia and the loosely defined region of Oceania is usually placed somewhere in the Malay Archipelago. The terms Southeast Asia and Oceania, devised in the 19th century, have had several different geographic meanings since their inception. The chief factor in determining which islands of the Malay Archipelago are Asian has been the location of the possessions of the various empires there. Lewis and Wigen assert, The narrowing of Southeast Asia to its present boundaries was thus a gradual process, Asia is larger and more culturally diverse than Europe. It does not exactly correspond to the borders of its various types of constituents. From the time of Herodotus a minority of geographers have rejected the three-continent system on the grounds there is no or is no substantial physical separation between them
2.
Middle East
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The Middle East is a transcontinental region centered on Western Asia and Egypt. The corresponding adjective is Middle-Eastern and the noun is Middle-Easterner. The term has come into usage as a replacement of the term Near East beginning in the early 20th century. Arabs, Turks, Persians, Kurds, and Azeris constitute the largest ethnic groups in the region by population. Indigenous minorities of the Middle East include Jews, Assyrians and other Arameans, Baloch, Berbers, Copts, Druze, Lurs, Mandaeans, Samaritans, Shabaks, Tats, in the Middle East, there is also a Romani community. European ethnic groups form a diaspora in the region include Albanians, Bosniaks, Circassians, Crimean Tatars, Franco-Levantines. Among other migrant populations are Bengalis as well as other Indians, Chinese, Filipinos, Indonesians, Pakistanis, the history of the Middle East dates back to ancient times, with the importance of the region being recognized for millennia. Most of the countries border the Persian Gulf have vast reserves of crude oil. The term Middle East may have originated in the 1850s in the British India Office, however, it became more widely known when American naval strategist Alfred Thayer Mahan used the term in 1902 to designate the area between Arabia and India. During this time the British and Russian Empires were vying for influence in Central Asia, Mahan realized not only the strategic importance of the region, but also of its center, the Persian Gulf. Mahan first used the term in his article The Persian Gulf and International Relations, published in September 1902 in the National Review, a British journal. The Middle East, if I may adopt a term which I have not seen, will some day need its Malta, as well as its Gibraltar, it does not follow that either will be in the Persian Gulf. The British Navy should have the facility to concentrate in force if occasion arise, about Aden, India, mahans article was reprinted in The Times and followed in October by a 20-article series entitled The Middle Eastern Question, written by Sir Ignatius Valentine Chirol. During this series, Sir Ignatius expanded the definition of Middle East to include regions of Asia which extend to the borders of India or command the approaches to India. After the series ended in 1903, The Times removed quotation marks from subsequent uses of the term, in the late 1930s, the British established the Middle East Command, which was based in Cairo, for its military forces in the region. After that time, the term Middle East gained broader usage in Europe, the description Middle has also led to some confusion over changing definitions. Before the First World War, Near East was used in English to refer to the Balkans and the Ottoman Empire, while Middle East referred to Iran, the Caucasus, Afghanistan, Central Asia, and Turkestan. The first official use of the term Middle East by the United States government was in the 1957 Eisenhower Doctrine, the Associated Press Stylebook says that Near East formerly referred to the farther west countries while Middle East referred to the eastern ones, but that now they are synonymous
3.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation
4.
Oman
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Oman, officially the Sultanate of Oman, is an Arab country on the southeastern coast of the Arabian Peninsula. The coast is formed by the Arabian Sea on the southeast, the Madha and Musandam exclaves are surrounded by the UAE on their land borders, with the Strait of Hormuz and Gulf of Oman forming Musandams coastal boundaries. From the late 17th century, the Omani Sultanate was an empire, vying with Portugal and Britain for influence in the Persian Gulf. At its peak in the 19th century, Omani influence or control extended across the Strait of Hormuz to modern-day Iran and Pakistan, as its power declined in the 20th century, the sultanate came under the influence of the United Kingdom. Historically, Muscat was the trading port of the Persian Gulf region. Muscat was also among the most important trading ports of the Indian Ocean, the Sultan Qaboos bin Said al Said has been the hereditary leader of the country since 1970. Sultan Qaboos is the current ruler in the Middle East. Oman has modest oil reserves, ranking 25th globally, nevertheless, in 2010 the UNDP ranked Oman as the most improved nation in the world in terms of development during the preceding 40 years. A significant portion of its economy is tourism and trade of fish, dates and this sets it apart from its neighbors solely oil-dependent economies. Oman is categorized as an economy and ranks as the 74th most peaceful country in the world according to the Global Peace Index. Two optically stimulated luminescence age estimates place the Arabian Nubian Complex at 106,000 years old and this supports the proposition that early human populations moved from Africa into Arabia during the Late Pleistocene. Dereaze, located in the city of Ibri, is the oldest known settlement in the area. Archaeological remains have been discovered here from the Stone Age and the Bronze Age, findings have included stone implements, animal bones, shells and fire hearths, with the latter dating back to 7615 BC as the oldest signs of human settlement in the area. Other discoveries include hand-molded pottery bearing distinguishing pre-Bronze Age marks, heavy flint implements, pointed tools, sumerian tablets refer to a country called Magan or Makan, a name believed to refer to Omans ancient copper mines. Mazoon, another used for the region, is derived from the word muzn. The present-day name of the country, Oman, is believed to originate from the Arab tribes who migrated to its territory from the Uman region of Yemen. Many such tribes settled in Oman, making a living by fishing, herding or stock breeding, from the 6th century BC to the arrival of Islam in the 7th century AD, Oman was controlled and/or influenced by three Persian dynasties, the Achaemenids, Parthians and Sassanids. A few scholars believe that in the 6th century BC, the Achaemenids exerted a strong degree of control over the Omani peninsula, Central Oman has its own indigenous so-called Late Iron Age cultural assemblage, the Samad al-Shan
5.
Saudi Arabia
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Saudi Arabia is bordered by Jordan and Iraq to the north, Kuwait to the northeast, Qatar, Bahrain and the United Arab Emirates to the east, Oman to the southeast and Yemen to the south. It is separated from Israel and Egypt by the Gulf of Aqaba and it is the only nation with both a Red Sea coast and a Persian Gulf coast and most of its terrain consists of arid desert and mountains. The area of modern-day Saudi Arabia formerly consisted of four regions, Hejaz, Najd and parts of Eastern Arabia. The Kingdom of Saudi Arabia was founded in 1932 by Ibn Saud and he united the four regions into a single state through a series of conquests beginning in 1902 with the capture of Riyadh, the ancestral home of his family, the House of Saud. Saudi Arabia has since been a monarchy, effectively a hereditary dictatorship governed along Islamic lines. The ultraconservative Wahhabi religious movement within Sunni Islam has been called the predominant feature of Saudi culture, with its global spread largely financed by the oil and gas trade. Saudi Arabia is sometimes called the Land of the Two Holy Mosques in reference to Al-Masjid al-Haram and Al-Masjid an-Nabawi, the state has a total population of 28.7 million, of which 20 million are Saudi nationals and 8 million are foreigners. The states official language is Arabic, petroleum was discovered on 3 March 1938 and followed up by several other finds in the Eastern Province. Saudi Arabia has since become the worlds largest oil producer and exporter, controlling the second largest oil reserves. The kingdom is categorized as a World Bank high-income economy with a high Human Development Index and is the only Arab country to be part of the G-20 major economies. However, the economy of Saudi Arabia is the least diversified in the Gulf Cooperation Council, the state has attracted criticism for its treatment of women and use of capital punishment. Saudi Arabia is an autocracy, has the fourth highest military expenditure in the world. Saudi Arabia is considered a regional and middle power, in addition to the GCC, it is an active member of the Organisation of Islamic Cooperation and OPEC. Following the unification of the Hejaz and Nejd kingdoms, the new state was named al-Mamlakah al-ʻArabīyah as-Suʻūdīyah by royal decree on 23 September 1932 by its founder, Abdulaziz Al Saud. Although this is translated as the Kingdom of Saudi Arabia in English it literally means the Saudi Arab kingdom. Its inclusion expresses the view that the country is the possession of the royal family. Al Saud is an Arabic name formed by adding the word Al, meaning family of or House of, in the case of the Al Saud, this is the father of the dynastys 18th century founder, Muhammad bin Saud. There is evidence that human habitation in the Arabian Peninsula dates back to about 125,000 years ago
6.
Arabian Sea
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The Arabian Sea is a region of the northern Indian Ocean bounded on the north by Pakistan and Iran, on the west by northeastern Somalia and the Arabian Peninsula, and on the east by India. Historically the sea has been known by names including the Erythraean Sea. Its total area is 3,862,000 km2 and its depth is 4,652 metres. The Gulf of Aden is in the southwest, connecting the Arabian Sea to the Red Sea through the strait of Bab-el-Mandeb, the Arabian Sea has been crossed by important marine trade routes since the third or second millennium BCE. Major seaports include Jawaharlal Nehru Port in Mumbai, the Port of Karachi and the Gwadar Port in Pakistan, other important ports include in India, Kandla Port, and Mormugao in Goa. The largest islands in the Arabian Sea include Socotra, Masirah Island, Astola Island, the Arabian Seas surface area is about 3,862,000 km2. The maximum width of the Sea is approximately 2,400 km, the biggest river flowing into the Sea is the Indus River. There are also the gulfs of Khambhat and Kutch on the Indian coast, the countries with coastlines on the Arabian Sea are Somalia, Djibouti, Yemen, Oman, United Arab Emirates, Iran, Pakistan, India and the Maldives. There are several cities on the seas coast including Mumbai, Surat, Karachi, Gwadar, Pasni, Ormara, Aden, Muscat, Keti Bandar, Salalah, Duqm. International Hydrographic Organization defines the limits of the Arabian Sea as follows, the Eastern limit of the Gulf of Aden. A line joining Ràs al Hadd, East point of Arabia, a line running from the South extremity of Addu Atoll, to the Eastern extreme of Ràs Hafun. The Western limit of the Laccadive Sea, by the time of Julius Caesar, several well-established combined land-sea trade routes depended upon water transport through the Sea around the rough inland terrain features to its north. Each major route involved transhipping to pack animal caravan, travel through country and risk of bandits. Later the kingdom of Axum arose in Ethiopia to rule a mercantile empire rooted in the trade with Europe via Alexandria, Jawaharlal Nehru Port in Mumbai is the largest port in the Arabian Sea, and the largest container port in India. The Port of Karachi is Pakistans largest and busiest seaport, handling about 60% of the nations cargo and it is located between the Karachi towns of Kiamari and Saddar, close to the main business district and several industrial areas. The geographic position of the places it in close proximity to major shipping routes such as the Strait of Hormuz. The history of the port is intertwined with that of the city of Karachi, several ancient ports have been attributed in the area including Krokola, Morontobara, Barbarikon (the Periplus of the Erythraean Sea, and Debal. It warns sailors about whirlpools and advises them to safety in Kaurashi harbour if they found themselves drifting dangerously
7.
Tihama
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Tihamah or Tihama refers to Red Sea coastal plain of Arabia from the Gulf of Aqaba to the Bab el Mandeb Strait. During the Islamic prophet Muhammads era, many military expedition took place including the Invasion of Hamra al-Asad. Beginning in January 623, some of the Muslims resorted to the tradition of raiding the Meccan caravans that traveled along the eastern coast of the Red Sea from Mecca to Syria. Communal life was essential for survival in conditions, as people needed support against the harsh environment. The tribal grouping was encouraged by the need to act as a unit. This unity was based on the bond of kinship by blood, the survival of nomads was also partially dependent on raiding caravans or oases, thus they saw this as no crime. While at Hamra al-Asad, Muhammad made an agreement with Mabad al-Khuzaah at Tihamah, Mabad was then sent to Mecca to spread false information. In Mecca, Mabad met with Abu Sufyan and spread disinformation that Muhammad had gathered a force to fight Abu Sufyan. Abu Sufyan and his companions were planning a massive and decisive attack on Medina to finish off the Muslims once, hearing Mabad’s talk of the great military strength of Muhammad, Abu Sufyan retreated from his plan of an immediate attack on the Muslims. In this fashion Muhammad successfully managed to prevent the onslaught the Meccans were planning. The region is subdivided into two parts, Tihamat Al-Hejaz and Tihamat ʿAsir. The Yemeni part is an extension of Tihamat ʿAsir, the plain is constricted and attains its greatest widths south of Medina and south of Mecca. The cities of Yanbu, Jeddah and Al Qunfudhah are located in the Hejazi part of Tihamah, the Asiri -Yemeni part of the Tihamah plain includes the cities of Jizan and Al Hudaydah. The temperatures in Tihamah are probably some of the hottest on earth, Tihamah in Arabic means severe heat and lack of wind. The extensive sandy coastal plain is a hot and inhospitable area parallel to the Red Sea, however, in a few places there is dense shrub composed almost exclusively of Acacia ehrenbergiana and it may be assumed that this was originally the dominant natural vegetation of the Tihamah. Salvadora persica occurs in thickets, and there are odd trees of Balanites aegyptiaca and colonies of wild doum palm, over sixteen megalithic standing stones were discovered by Edward Keall, director of the Royal Ontario Museums Canadian Archaeological Mission near the village of al-Mutaynah in the Tihamah area. The stones were made of granite and weighted up to 20 tonnes, three of the upright stones measured around 8 feet tall with one fallen being over 20 metres in length. Copper tools suggested to date to the era as the construction of the stones were dated to around 2400 to 1800 BCE
8.
Kawkaban
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Kawkaban is a town in the northern-western part of Yemen, containing a fortified citadel about 2,931 m above sea level. The city is built upon a hilltop, walled from the north. It was a capital of Bani Sharaf Al-Deen in the 9th century AH and it was also home to a Jewish community, until its demise in the mid-20th century. The city affords a good prospect of the surrounding countryside, the city features several old mosques, Almadrasa, Almansoor, Alsharefa and Harabat. The old market is located in the middle of the city, old rainwater reservoirs can also be seen in the fortified town, named Meseda, Alasdad, and Sedalhamam. ”Of the citys more popular citizens was the renowned Jewish poet, Zechariah Dhahiri. The name Kawkaban, or two stars, is said to be derived from two ornate palaces that are built in the city, and which are said to have resembled stars at night
9.
Yemen
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Yemen, officially known as the Republic of Yemen, is an Arab country in Western Asia, occupying South Arabia, the southern end of the Arabian Peninsula. Yemen is the second-largest country in the peninsula, occupying 527,970 km2, the coastline stretches for about 2,000 km. It is bordered by Saudi Arabia to the north, the Red Sea to the west, the Gulf of Aden and Arabian Sea to the south, although Yemens constitutionally stated capital is the city of Sanaa, the city has been under rebel control since February 2015. Because of this, Yemens capital has been relocated to the port city of Aden. Yemens territory includes more than 200 islands, the largest of these is Socotra, Yemen was the home of the Sabaeans, a trading state that flourished for over a thousand years and probably also included parts of modern-day Ethiopia and Eritrea. In 275 AD, the region came under the rule of the later Jewish-influenced Himyarite Kingdom, Christianity arrived in the fourth century, whereas Judaism and local paganism were already established. Islam spread quickly in the century and Yemenite troops were crucial in the expansion of the early Islamic conquests. Administration of Yemen has long been notoriously difficult, several dynasties emerged from the ninth to 16th centuries, the Rasulid dynasty being the strongest and most prosperous. The country was divided between the Ottoman and British empires in the twentieth century. The Zaydi Mutawakkilite Kingdom of Yemen was established after World War I in North Yemen before the creation of the Yemen Arab Republic in 1962, South Yemen remained a British protectorate known as the Aden Protectorate until 1967 when it became an independent state and later, a Marxist state. The two Yemeni states united to form the modern republic of Yemen in 1990, Yemen is a developing country, and the poorest country in the Middle East. Under the rule of President Ali Abdullah Saleh, Yemen was described as a kleptocracy, according to the 2009 international corruption Perception Index by Transparency International, Yemen ranked 164 out of 182 countries surveyed. President Saleh stepped down and the powers of the presidency were transferred to Vice President Abd Rabbuh Mansur Hadi, the transitional process was disrupted by conflicts between the Houthis and al-Islah, as well as the al-Qaeda insurgency. In September 2014, the Houthis took over Sanaa, later declaring themselves in control of the government in a coup détat, since then, a Saudi-led intervention has taken place, however, it could not stop the civil war. Instead, the Saudis and the others have destroyed some hospitals, schools and homes, Yemen was mentioned in Old South Arabian inscriptions as Yamnat. In Arabic literature, the term includes much greater territory than that of the republic of Yemen. It stretches from the northern Asir Region in southwestern Saudi Arabia to Dhofar Governorate in southern Oman, one etymology derives Yemen from yumn, meaning felicity, as much of the country is fertile. The Romans called it Arabia Felix, as opposed to Arabia Deserta, al-Yaman significantly plays on the notion of the land to the right, when in Mecca facing the dawn, complementary to Al-Sham, the Land to the Left, referring to the Levant
10.
Southwest Asia
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Western Asia, West Asia, Southwestern Asia or Southwest Asia is the westernmost subregion of Asia. The concept is in limited use, as it overlaps with the Middle East. The term is used for the purposes of grouping countries in statistics. The total population of Western Asia is an estimated 300 million as of 2015, in an unrelated context, the term is also used in ancient history and archaeology to divide the Fertile Crescent into the Asiatic or Western Asian cultures as opposed to ancient Egypt. As a geographic concept, Western Asia almost always includes the Levant, Mesopotamia, the term is used pragmatically and has no correct or generally agreed-upon definition. In contrast to this definition, the United Nations Industrial Development Organisation in its 2015 yearbook also includes Armenia and Azerbaijan, unlike the UNIDO, the United Nations Statistics Division excludes Iran from Western Asia and include Turkey, Georgia, and Cyprus in the region. These four countries are listed in the European category of the United Nations Educational, Scientific, the Olympic Council of Asias multi-sport event West Asian Games are contested by athletes representing these thirteen countries. Among the regions sports organisations are the West Asia Basketball Association, West Asian Billiards and Snooker Federation, West Asian Football Federation, Western Asia was in use as a geographical term in the early 19th century, even before Near East became current as a geopolitical concept. Use of the term in the context of contemporary geopolitics or world economy appears to date from the 1960s, Western Asia is located directly south of Eastern Europe. The region is surrounded by seven major seas, the Aegean Sea, the Black Sea, the Caspian Sea, the Persian Gulf, the Arabian Sea, the Red Sea, and the Mediterranean Sea. The Dasht-e Kavir and Dasht-e Lut deserts in eastern Iran naturally delimit the region somewhat from Asia itself, three major tectonic plates converge on Western Asia, including the African, Eurasian, and Arabian plates. The boundaries between the plates make up the Azores-Gibraltar Ridge, extending across North Africa, the Red Sea. The Arabian Plate is moving northward into the Anatolian plate at the East Anatolian Fault, several major aquifers provide water to large portions of Western Asia. In Saudi Arabia, two large aquifers of Palaeozoic and Triassic origins are located beneath the Jabal Tuwayq mountains and areas west to the Red Sea. Cretaceous and Eocene-origin aquifers are located beneath large portions of central and eastern Saudi Arabia, including Wasia, flood or furrow irrigation, as well as sprinkler methods, are extensively used for irrigation, covering nearly 90,000 km² across Western Asia for agriculture. Western Asia is primarily arid and semi-arid, and can be subject to drought, the region consists of grasslands, rangelands, deserts, and mountains. Water shortages are a problem in parts of West Asia, with rapidly growing populations increasing demands for water. Major rivers, including the Tigris and Euphrates, provide sources for water to support agriculture
11.
Arabian Peninsula
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The Arabian Peninsula, simplified Arabia is a peninsula of Western Asia situated northeast of Africa on the Arabian plate. From a geological perspective, it is considered a subcontinent of Asia and it is the largest peninsula in the world, at 3,237,500 km2. The Arabian Peninsula consists of the countries Yemen, Oman, Qatar, Bahrain, Kuwait, Saudi Arabia, the Arabian Peninsula plays a critical geopolitical role in the Middle East and the Arab world due to its vast reserves of oil and natural gas. Before the modern era, it was divided into four regions, Hejaz, Najd, Southern Arabia. Hejaz and Najd make up most of Saudi Arabia, Southern Arabia consists of Yemen and some parts of Saudi Arabia and Oman. Eastern Arabia consists of the coastal strip of the Persian Gulf. The most prominent feature of the peninsula is desert, but in the southwest there are mountain ranges, harrat ash Shaam is a large volcanic field that extends from the northwestern Arabian Peninsula into Jordan and southern Syria. The peninsulas constituent countries are Kuwait, Bahrain, Qatar, the island nation of Bahrain lies off the east coast of the peninsula. Six countries form the Gulf Cooperation Council, however, this is a disputed term. The Kingdom of Saudi Arabia covers the part of the peninsula. The majority of the population of the live in Saudi Arabia. The peninsula contains the worlds largest reserves of oil, Saudi Arabia and the UAE are economically the wealthiest in the region. Qatar, a peninsula in the Persian Gulf on the larger peninsula, is home of the Arabic-language television station Al Jazeera. Kuwait, on the border with Iraq, is an important country strategically, though historically lightly populated, political Arabia is noted for a high population growth rate - as the result of both very strong inflows of migrant labor as well as sustained high birth rates. The population tends to be young and heavily skewed gender ratio dominated by males. In many states, the number of South Asians exceeds that of the local citizenry, the four smallest states, which have their entire coastlines on the Persian Gulf, exhibit the worlds most extreme population growth, roughly tripling every 20 years. In 2014, the population of the Arabian Peninsula was 77,983,936. Listed here are the human Y-chromosome DNA haplogroups in Arabia Haplogroup J is the most abundant component in the Arabian peninsula and its two main subclades, show opposite latitudinal gradients in the Middle East
12.
Bab-el-Mandeb
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The Bab-el-Mandeb or Mandeb Strait is a strait located between Yemen on the Arabian Peninsula, and Djibouti and Eritrea in the Horn of Africa. It connects the Red Sea to the Gulf of Aden, the Bab-el-Mandeb acts as a strategic link between the Indian Ocean and the Mediterranean Sea via the Red Sea and the Suez Canal. In 2006, an estimated 3.3 million barrels of oil passed through the strait per day, the distance across is about 20 miles from Ras Menheli in Yemen to Ras Siyyan in Djibouti. Near the coast of Djibouti lies a group of islands known as the Seven Brothers. There is a surface current inwards in the channel, but a strong undercurrent outwards in the western channel. Paleo-environmental and tectonic events in the Miocene epoch created the Danakil Isthmus, during the last 100,000 years eustatic sea level fluctuations have led to alternate opening and closing of the straits. According to the recent single origin hypothesis, the straits of Bab-el-Mandeb were probably witness to the earliest migrations of modern humans. It is presumed that at time, the oceans were much lower. The Kingdom of Aksum was a regional power in the Horn of Africa. It extended its rule across the strait with the conquest of the Himyarite Kingdom shortly before the rise of Islam, the United Kingdom unilaterally seized the island of Perim in 1799 on behalf of its Indian empire. Britain reasserted its ownership in 1857 and erected a lighthouse there in 1861, using it to command the Red Sea and the trade routes through the Suez Canal. On February 22,2008, a company owned by Tarek bin Laden unveiled plans to build a bridge named Bridge of the Horns across the strait, linking Yemen with Djibouti. Middle East Development LLC has issued a notice to construct a bridge passing across the Red Sea that would be the longest suspended passing in the world, the project has been assigned to engineering company COWI in collaboration with architect studio Dissing+Weitling, both from Denmark. It was announced in 2010 that Phase 1 had been delayed, the Bab-el-Mandeb is also a sub-region in the Arab League, which includes Djibouti, Yemen, and Eritrea. 91 Notice-to-Proceed Launches Ambitious Red Sea Crossing Sea crossing
13.
Red Sea
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The Red Sea is a seawater inlet of the Indian Ocean, lying between Africa and Asia. The connection to the ocean is in the south through the Bab el Mandeb strait, to the north lie the Sinai Peninsula, the Gulf of Aqaba, and the Gulf of Suez. The Red Sea is a Global 200 ecoregion, the sea is underlain by the Red Sea Rift which is part of the Great Rift Valley. The Red Sea has an area of roughly 438,000 km2, is about 2250 km long and. It has a depth of 2211 m in the central median trench. However, there are also extensive shallow shelves, noted for their marine life, the sea is the habitat of over 1,000 invertebrate species, and 200 soft and hard corals. It is the worlds northernmost tropical sea, the International Hydrographic Organization defines the limits of the Red Sea as follows, On the North. The Southern limits of the Gulfs of Suez and Aqaba, a line joining Husn Murad and Ras Siyyan. Red Sea is a translation of the Greek Erythra Thalassa, Latin Mare Rubrum, Arabic, البحر الأحمر. Al-Baḥr Al-Aḥmar, Somali Badda Cas and Tigrinya Qeyyiḥ bāḥrī, the name of the sea may signify the seasonal blooms of the red-coloured Trichodesmium erythraeum near the waters surface. A theory favored by modern scholars is that the name red is referring to the direction south. The basis of this theory is that some Asiatic languages used color words to refer to the cardinal directions, herodotus on one occasion uses Red Sea and Southern Sea interchangeably. Historically, it was known to western geographers as Mare Mecca. Some ancient geographers called the Red Sea the Arabian Gulf or Gulf of Arabia. C, in that version, the Yam Suph is translated as Erythra Thalassa. The Red Sea is one of four seas named in English after common color terms — the others being the Black Sea, the White Sea and the Yellow Sea. The direct rendition of the Greek Erythra thalassa in Latin as Mare Erythraeum refers to the part of the Indian Ocean. The earliest known exploration of the Red Sea was conducted by ancient Egyptians, one such expedition took place around 2500 BC, and another around 1500 BC. Both involved long voyages down the Red Sea, historically, scholars argued whether these trips were possible
14.
Indian Ocean
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The Indian Ocean is the third largest of the worlds oceanic divisions, covering 70,560,000 km2. It is bounded by Asia on the north, on the west by Africa, on the east by Australia, the Indian Ocean is known as Ratnākara, the mine of gems in ancient Sanskrit literature, and as Hind Mahāsāgar, in Hindi. The northernmost extent of the Indian Ocean is approximately 30° north in the Persian Gulf, the oceans continental shelves are narrow, averaging 200 kilometres in width. An exception is found off Australias western coast, where the width exceeds 1,000 kilometres. The average depth of the ocean is 3,890 m and its deepest point is Diamantina Deep in Diamantina Trench, at 8,047 m deep, Sunda Trench has a depth of 7, 258–7,725 m. North of 50° south latitude, 86% of the basin is covered by pelagic sediments. The remaining 14% is layered with terrigenous sediments, glacial outwash dominates the extreme southern latitudes. The major choke points include Bab el Mandeb, Strait of Hormuz, the Lombok Strait, the Strait of Malacca, the Indian Ocean is artificially connected to the Mediterranean Sea through the Suez Canal, which is accessible via the Red Sea. All of the Indian Ocean is in the Eastern Hemisphere and the centre of the Eastern Hemisphere is in this ocean, marginal seas, gulfs, bays and straits of the Indian Ocean include, The climate north of the equator is affected by a monsoon climate. Strong north-east winds blow from October until April, from May until October south, in the Arabian Sea the violent Monsoon brings rain to the Indian subcontinent. In the southern hemisphere, the winds are milder. When the monsoon winds change, cyclones sometimes strike the shores of the Arabian Sea, the Indian Ocean is the warmest ocean in the world. Long-term ocean temperature records show a rapid, continuous warming in the Indian Ocean, Indian Ocean warming is the largest among the tropical oceans, and about 3 times faster than the warming observed in the Pacific. Research indicates that human induced greenhouse warming, and changes in the frequency, among the few large rivers flowing into the Indian Ocean are the Zambezi, Shatt al-Arab, Indus, Godavari, Krishna, Narmada, Ganges, Brahmaputra, Jubba and Irrawaddy River. The oceans currents are controlled by the monsoon. Two large gyres, one in the northern hemisphere flowing clockwise and one south of the equator moving anticlockwise, during the winter monsoon, however, currents in the north are reversed. Deep water circulation is controlled primarily by inflows from the Atlantic Ocean, the Red Sea, north of 20° south latitude the minimum surface temperature is 22 °C, exceeding 28 °C to the east. Southward of 40° south latitude, temperatures drop quickly, surface water salinity ranges from 32 to 37 parts per 1000, the highest occurring in the Arabian Sea and in a belt between southern Africa and south-western Australia
15.
Gulf of Aden
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The Gulf of Aden is a gulf located in the Arabian Sea between Yemen, on the south coast of the Arabian Peninsula, and Somalia in the Horn of Africa. In the northwest, it connects with the Red Sea through the Bab-el-Mandeb strait and it shares its name with the port city of Aden in Yemen, which forms the northern shore of the gulf. Historically, the Gulf of Aden was known as The Gulf of Berbera, however, as the city of Aden grew during the colonial era, the name of Gulf of Aden was popularised. The waterway is part of the important Suez Canal shipping route between the Mediterranean Sea and the Arabian Sea in the Indian Ocean with 21,000 ships crossing the gulf annually. The name of the Gulf was inspired by the former British Crown Colony city of Aden, the Somali names are Gacanka Cadmeed or Gacanka Saylac. The International Hydrographic Organization defines the limits of the Gulf of Aden as follows, on the Northwest – The eastern limit of the Gulf of Tadjoura. On the East – The meridian of Cape Guardafui, the temperature of the Gulf of Aden varies between 15 °C and 28 °C, depending on the season and the appearance of monsoons. The Gulf of Aden is a waterway for shipping, especially for Persian Gulf oil. Approximately 11 percent of the worlds petroleum passes through the Gulf of Aden on its way to the Suez Canal or to regional refineries. The main ports along the gulf are Aden in Yemen, Djibouti City in Djibouti, in earlier history, the city of Crater, located just south of the modern city of Aden, was an important port in regional trade. In the late 2000s, the gulf evolved into a hub of pirate activity, by 2013, attacks in the waters had steadily declined due to active private security and international navy patrols. India receives USD50 billion in imports and sends USD60 billion in exports through this area annually, because of this and for the sake of protecting the trade of other countries, India keeps a warship escort in this area. Also see Piracy in Gulf of Aden, a geologically young body of water, the Gulf of Aden has a unique biodiversity that contains many varieties of fish, coral, seabirds and invertebrates. This rich ecological diversity has benefited from a lack of pollution during the history of human habitation around the gulf. However, environmental groups fear that the lack of an effort to control pollution may jeopardize the gulfs ecosphere. Whales, dolphins, and dugongs were common before being severely reduced by commercial hunts, including by mass illegal hunts by Soviet Union
16.
Perim
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Perim, also called Mayyun in Arabic, is a volcanic island in the Strait of Mandeb at the south entrance into the Red Sea, off the south-west coast of Yemen and belonging to Yemen. The island of Perim divides the strait of Mandeb into two channels, the island was occupied by Great Britain from 1857 to 1967. Perim is called the island of Diodorus by Pliny the Elder, Perim possibly derives from the Arab term Barim associated with the history of the Straits and one of its Arab names, the other Arab name being Mayyun. The Portuguese called it Majun or Meho, although Albuquerque had solemnly named the island Vera Cruz in 1513, on many British and French maps of the 17th and 18th century the island is called Babelmandel, as the Straits are. Some early 19th century navigation guides still call it the island of Bab-el-Mandeb although they may mention that it is also called Perim, by the time the British permanently occupied the island in 1857, the name Perim had come into general usage. Perim island is a fragment of the southwest flank of a late Miocene volcano whose center was on the southwesternmost tip of Arabia. The volcano is the westernmost of the east-west line of six central vent volcanoes that extends 200 km along the coast of Arabia from Perim to Aden. It is believed that the volcanism is related to an eastward-propagating rift produced before the most recent stage of sea-floor spreading in the Gulf of Aden, Perim is crab-shaped,5.63 km long and 2.85 km wide. It has an area of 13 km2 and rises to an altitude of 65 m. Perim encloses a deep and comparatively large natural harbour on the southwestern coast, the fishing village of Mayyun is located at the bottom of the bay. The island divides the 32 km wide Bab-el-Mandeb into two, the Large Strait, with a width of 17 km, and the Small Strait. The Large Strait is generally deep water varying from about 100 fathoms or more in the channel to about 3 to 6 fathoms close to the coastal reefs. The depth of the Small Strait varies from 12 to 15 ½ fathoms and is free from navigational changes in the fairway but strong, there has been frequent shipwrecks in the vicinity of Perim, particularly in the Small Strait. The absence of water on the island has always been one of the major difficulties impeding permanent settlement. Although there are heavy rains, there may be stretches of eight months or more without rain. The straits of Bab-el-Mandeb were probably witness to the earliest migrations of modern humans out of Africa roughly 60,000 years ago, at this time the oceans were much lower because so much water was frozen in Ice Age glaciers and the straits were much shallower or dry. As a result, only fishermen and pearl divers lived there seasonally, having failed in his main objective, he nonetheless sailed for the Red Sea. The Red Sea pilots of those lived on an island close to Perim
17.
Socotra
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Socotra, also spelled Soqotra, is an island and a small archipelago of four islands in the Arabian Sea. The territory is part of Yemen, and had long been a subdivision of the Aden Governorate, in 2004, it became attached to the Hadhramaut Governorate, which is much closer to the island than Aden. In 2013, the archipelago became its own governorate, the Soqatra Governorate, the island of Socotra constitutes around 95% of the landmass of the archipelago. It lies some 240 kilometres east of the Horn of Africa and 380 kilometres south of the Arabian Peninsula, the island is very isolated and a third of its plant life is found nowhere else on the planet. It has been described as the most alien-looking place on Earth, the island measures 132 kilometres in length and 49.7 kilometres in width. In the notes to his translation of the Periplus of the Erythraean Sea, huntingford remarks that the name Suqotra is not Greek in origin, but from the Sanskrit dvīpa sukhadhara. Another posited origin of the name is the Arabic suq meaning market, there was initially an Oldowan culture in Socotra. Oldowan stone tools were found in the area around Hadibo by V. A, zhukov, a member of the Russian Complex Expedition in 2008. Socotra appears as Dioskouridou in the Periplus of the Erythraean Sea, in 2001 a group of Belgian speleologists of the Socotra Karst Project investigated a cave on the island Socotra. There, they came across a number of inscriptions, drawings. Further investigation showed that these had left by sailors who visited the island between the 1st century BC and the 6th century AD. Most of the texts are written in the Indian Brāhmī script and this corpus of nearly 250 texts and drawings thus constitutes one of the main sources for the investigation of Indian Ocean trade networks in that time period. A local tradition holds that the inhabitants were converted to Christianity by Thomas the Apostle in AD52, in the 10th century, the Arab geographer Abu Muhammad al-Hasan al-Hamdani stated that in his time most of the inhabitants were Christians. They were Nestorians but also practised ancient magic rituals despite the warnings of their archbishop and he reported in a letter home that the tribesmen, due to lack of missionaries, had only retained a faint knowledge of Christianity. In 1507, a Portuguese fleet commanded by Tristão da Cunha with Afonso de Albuquerque landed at the capital of Suq. Their objective was to set a base in a place on the route to India. Tomás Fernandes started to build a fortress at Suq, the Forte de São Miguel de Socotorá, however, the infertility of the land led to famine and sickness in the garrison. Thus the Portuguese abandoned the island four years later, as it was not advantageous as a base, the islands passed under the control of the Mahra sultans in 1511, and its inhabitants were completely Islamized during their rule
18.
Arabian Plate
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The Arabian Plate is a minor tectonic plate in the northern and eastern hemispheres. It is one of three continental plates that have been moving northward in recent geological history and colliding with the Eurasian Plate, the Arabian Plate consists mostly of the Arabian peninsula, it extends eastward at the Sinai and the Red Sea and northward to the Levant. The Arabian Plate was part of the African plate during much of the Phanerozoic Eon, the opening of the Red Sea rift led to extensive volcanic activity. There are large volcanic fields called the Older Harrats, such as Harrat Khaybar and Harrat Rahat, some activity still continues especially around Medina, and there are regular eruptions within the Red Sea. The collision between the Arabian Plate and Eurasia is pushing up the Zagros Mountains of Iran, because the Arabian Plate and Eurasian Plate collide, many cities are in danger such as those in southeastern Turkey. These dangers include earthquakes, tsunamis, and volcanoes, countries within the plate include Lebanon, Syria, Djibouti, Yemen, Oman, Qatar, Bahrain, Kuwait, Iraq, Saudi Arabia, Jordan, and the United Arab Emirates. Regions include parts of the Southern Denkalya Subregion, the Southeastern Anatolia Region, Awdal and the Khuzestan Province
19.
Tihamah
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Tihamah or Tihama refers to Red Sea coastal plain of Arabia from the Gulf of Aqaba to the Bab el Mandeb Strait. During the Islamic prophet Muhammads era, many military expedition took place including the Invasion of Hamra al-Asad. Beginning in January 623, some of the Muslims resorted to the tradition of raiding the Meccan caravans that traveled along the eastern coast of the Red Sea from Mecca to Syria. Communal life was essential for survival in conditions, as people needed support against the harsh environment. The tribal grouping was encouraged by the need to act as a unit. This unity was based on the bond of kinship by blood, the survival of nomads was also partially dependent on raiding caravans or oases, thus they saw this as no crime. While at Hamra al-Asad, Muhammad made an agreement with Mabad al-Khuzaah at Tihamah, Mabad was then sent to Mecca to spread false information. In Mecca, Mabad met with Abu Sufyan and spread disinformation that Muhammad had gathered a force to fight Abu Sufyan. Abu Sufyan and his companions were planning a massive and decisive attack on Medina to finish off the Muslims once, hearing Mabad’s talk of the great military strength of Muhammad, Abu Sufyan retreated from his plan of an immediate attack on the Muslims. In this fashion Muhammad successfully managed to prevent the onslaught the Meccans were planning. The region is subdivided into two parts, Tihamat Al-Hejaz and Tihamat ʿAsir. The Yemeni part is an extension of Tihamat ʿAsir, the plain is constricted and attains its greatest widths south of Medina and south of Mecca. The cities of Yanbu, Jeddah and Al Qunfudhah are located in the Hejazi part of Tihamah, the Asiri -Yemeni part of the Tihamah plain includes the cities of Jizan and Al Hudaydah. The temperatures in Tihamah are probably some of the hottest on earth, Tihamah in Arabic means severe heat and lack of wind. The extensive sandy coastal plain is a hot and inhospitable area parallel to the Red Sea, however, in a few places there is dense shrub composed almost exclusively of Acacia ehrenbergiana and it may be assumed that this was originally the dominant natural vegetation of the Tihamah. Salvadora persica occurs in thickets, and there are odd trees of Balanites aegyptiaca and colonies of wild doum palm, over sixteen megalithic standing stones were discovered by Edward Keall, director of the Royal Ontario Museums Canadian Archaeological Mission near the village of al-Mutaynah in the Tihamah area. The stones were made of granite and weighted up to 20 tonnes, three of the upright stones measured around 8 feet tall with one fallen being over 20 metres in length. Copper tools suggested to date to the era as the construction of the stones were dated to around 2400 to 1800 BCE
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Arabian Peninsula coastal fog desert
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The Arabian Peninsula coastal fog desert on the southern coasts of the Arabian peninsula is an ecoregion which experiences thick fogs where visibility may be reduced to 33 feet. It is classed as an Afrotropic fog desert This ecosystem exists on a strip along the western and eastern coasts of Arabia and it follows the coast of Oman southward from Masirah Island and reaches inland to 120 km in the Jiddat al Harasisi plateau and the Dhofar mountains. From here it continues as a narrow strip along the coast of Yemen. In this region, although it rains the fog provides moisture sufficient to nurture a great deal of grassland, shrubs. There are over sixty species of plant. This coastal strip is of importance as further inland where the fog does not have an influence most of the Arabian Peninsula is desert. Vegetation varies progressively away from the coast which features dense woodland of Anogeissus dhofarica, Acacia senegal and various thorny Commiphora trees, the richest flora can be found in the Dhofar mountains which have 900 plants including 60 endemic species and two endemic genera, Cibirhiza and Dhofaria. One of these plants, the Frankincense tree was a source of wealth for Dhofar in antiquity. In Yemen the side of Jabal Urays facing the sea is covered with Euphorbia balsamifera shrubs, the many mammals found here include the Arabian Oryx which was reintroduced to the wild after disappearing, gazelles and the Nubian ibex, a goat antelope. Predators found on the coast include caracals, Arabian wolf, striped hyaena and the critically endangered Arabian leopard, the Arabian Gazelle which once lived on the peninsula is now extinct. The main threat to this ecosystem is overgrazing by increasing numbers of cattle and other livestock as well as off-road driving, protected areas in Oman include the controversial Arabian Oryx Sanctuary where the reintroduction took place, and Jebel Samhan Nature Reserve established for the protection of the leopards. There are a number of Important Bird Areas on the coast of Yemen but none are officially protected
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Ecoregion
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An ecoregion is an ecologically and geographically defined area that is smaller than a bioregion, which in turn is smaller than an ecozone. All three of these are less or greater than an ecosystem. Ecoregions cover relatively large areas of land or water, and contain characteristic, the biodiversity of flora, fauna and ecosystems that characterise an ecoregion tends to be distinct from that of other ecoregions. Three caveats are appropriate for all bio-geographic mapping approaches, firstly, no single bio-geographic framework is optimal for all taxa. Ecoregions reflect the best compromise for as many taxa as possible, secondly, ecoregion boundaries rarely form abrupt edges, rather, ecotones and mosaic habitats bound them. Thirdly, most ecoregions contain habitats that differ from their assigned biome, biogeographic provinces may originate due to various barriers. Some physical, some climatic and some ocean chemical related, the history of the term is somewhat vague as it was used in many contexts, forest classifications, biome classifications, biogeographic classifications, etc. The concept of ecoregion of Bailey gives more importance to ecological criteria, while the WWF concept gives more importance to biogeography, there is significant, but not absolute, spatial correlation among these characteristics, making the delineation of ecoregions an imperfect science. Such transition zones are called ecotones, Ecoregions can be categorized using an algorithmic approach or a holistic, “weight-of-evidence” approach where the importance of various factors may vary. An example of the approach is Robert Bailey’s work for the U. S. The intended purpose of ecoregion delineation may affect the method used, according to WWF, the boundaries of an ecoregion approximate the original extent of the natural communities prior to any major recent disruptions or changes. WWF has identified 867 terrestrial ecoregions, and approximately 450 freshwater ecoregions across the Earth, the use of the term ecoregion is an outgrowth of a surge of interest in ecosystems and their functioning. In particular, there is awareness of issues relating to spatial scale in the study and it is widely recognized that interlinked ecosystems combine to form a whole that is greater than the sum of its parts. The Global 200 is the list of ecoregions identified by WWF as priorities for conservation, Terrestrial ecoregions are land ecoregions, as distinct from freshwater and marine ecoregions. In this context, terrestrial is used to mean of land, WWF ecologists currently divide the land surface of the Earth into 8 major ecozones containing 867 smaller terrestrial ecoregions. The WWF effort is a synthesis of previous efforts to define. Many consider this classification to be decisive, and some propose these as stable borders for bioregional democracy initiatives. The eight terrestrial ecozones follow the major floral and faunal boundaries, identified by botanists and zoologists, ecozone boundaries generally follow continental boundaries, or major barriers to plant and animal distribution, like the Himalayas and the Sahara
22.
Wadi
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Wadi is the Arabic and Hebrew term traditionally referring to a valley. In some instances, it may refer to a dry riverbed that contains water only during times of heavy rain, the term wādī is very widely found in Arabic toponyms. Seasonal streams, frequent in south-east Spain, are called ramblas instead, in the Maghreb, the term wadi is applied to all rivers including regular ones. Wadis are located on the sloping, nearly flat parts of deserts, commonly they begin on the distal portions of fans. In basin and range topography, wadis trend along basin axes at the terminus of fans, permanent channels do not exist, due to lack of continual water flow. Wadi show braided stream patterns because of the deficiency of water, Water percolates down into the stream bed causing abrupt loss in energy and resulting vast deposition. Wadis may develop dams of sediment which results in change of stream patterns in the flash flood. Wind also plays its role in deposition, when wadi sediments are underwater or moist, wind sediments are deposited over them. Thus wadi sediments contain both wind and water sediments, wadi sediments may contain whole range from gravel to mud. There is also range of sedimentary structures. Thus, wadi sediments are most diagnostic of all other desert environments, flash floods represents severe energy conditions and results in wide range of sedimentary structures, including ripples and commonly plane beds. Gravels common display imbrications, Mud drapes show desiccation cracks, wind activity also generates its own sedimentary structures, large scales cross-stratification and wedge shape cross-sets are present. Typical wadi sequence consists of alternating units of wind and water sediments, Water laid sediments show complete fining upward sequence. Wind deposits are stratified and covered with mud-cracked deposits. Some horizontal Loess may also present, modern English usage differentiates a wadi from another canyon or wash by the action and prevalence of water. Wadis, as courses, are formed by water, but are distinguished from river valleys or gullies in that surface water is intermittent or ephemeral. Wadis are generally dry year round, except after a rain, the desert environment is characterized by sudden but infrequent heavy rainfall, often resulting in flash floods. Crossing wadis at certain times of the year can be dangerous as a result, Wadis tend to be associated with centers of human population because sub-surface water is sometimes available in them
23.
Hadhramaut
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Hadhramaut, Hadhramout, Hadramawt or Ḥaḍramūt is a region on the southern end of the Arabian Peninsula. The name is retained in Hadhramaut Governorate of the Republic of Yemen. The people of Hadhramaut are called Hadhrami and speak Hadhrami Arabic, the origin of the name Ḥaḍramawt is not exactly known, and there are numerous competing hypotheses about its meaning. The most common etymology is that the regions name means death has come, from حضر /ḥaḍara/ and موت /mawt/. One explanation is that this is a nickname of Amar ibn Qaḥṭān, Ḥaḍramawt is also identified with Biblical Hazarmawet. There, it is the name of a son of Joktan, according to various Bible dictionaries, the name Hazarmaveth means court of death, reflecting a meaning similar to the Arabic folk etymologies. Scholarly theories of the origin are somewhat more varied. In a Nova interview, he described Ubar as a kind of fortress/administration center set up to protect the supply from raiding Bedouin tribes. Surrounding the site, as far as six miles away, were smaller villages, an interesting parallel to this are the fortified water holes in the Eastern Desert of Egypt from Roman times. Though it accurately describes the configuration of settlements in the Pre-Islamic Wadi Ḥaḍramawt, already in the Pre-Islamic period, variations of the name are attested as early as the middle of the First Millennium BC. The names ḥḍrmt and ḥḍrmwt are found in texts of the Old South Arabian languages, in either form, the word itself can be a toponym, a tribal name, or the name of the kingdom of Ḥaḍramawt. In the late Fourth or early Third Century BC, Theophrastus gives the name Άδρραμύτα, as Southern Arabia is the homeland of the South Semitic language subfamily, a Semitic origin for the name is highly likely. Kamal Salibi proposed an etymology for the name which argues that the diphthong aw in the name is an incorrect vocalization. He proposes, then, that the means the green place. The undefined northern edge of Hadhramaut slopes down to the desert Empty Quarter, in a wider sense, Hadhramaut includes the territory of Mahra to the east all the way to the contemporary border with Oman. This encompasses the current governorates of Hadramaut and Mahra in their entirety as well as parts of the Shabwah Governorate, the Hadhramis live in densely built towns centered on traditional watering stations along the wadis. Hadhramis harvest crops of wheat and millet, tend date palm and coconut groves, on the plateau, Bedouins tend sheep and goats. In Hyderabad and Aurangabad, the community is known as Chaush, in Gujarat, the Surrati people reign from Hadhramaut
24.
Rub' al Khali
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The Rub al Khali is the largest contiguous sand desert in the world, encompassing most of the southern third of the Arabian Peninsula. The desert covers some 650,000 square kilometres including parts of Saudi Arabia, Oman, the United Arab Emirates and it is part of the larger Arabian Desert. The desert is 1,000 kilometres long, and 500 kilometres wide and its surface elevation varies from 800 metres in the southwest to around sea level in the northeast. The terrain is covered with dunes with heights up to 250 metres, interspersed with gravel. The sand is of a reddish-orange color due to the presence of feldspar, there are also brackish salt flats in some areas, such as the Umm al Samim area on the deserts eastern edge. Along the middle length of the desert there are a number of raised, hardened areas of carbonate, gypsum, marl. These lakes existed during periods from 6,000 to 5,000 years ago and 3,000 to 2,000 years ago. The lakes are thought to have formed as a result of cataclysmic rainfall similar to present-day monsoon rains and most probably lasted for only a few years. However, lakes in the Mundafen area in the southwest of the Rub al Khali show evidence of lasting longer, up to 800 years, evidence suggests that the lakes were home to a variety of flora and fauna. Fossil remains indicate the presence of animal species, such as hippopotamus, water buffalo. The lakes also contained small snails, ostracods, and when conditions were suitable, deposits of calcium carbonate and opal phytoliths indicate the presence of plants and algae. There is also evidence of activity dating from 3,000 to 2,000 years ago, including chipped flint tools. The region has a hot climate typical of the larger Arabian Desert. The region is classified as hyper-arid, with annual rainfall of less than 3 centimetres. Daily maximum temperatures average at 47 °C and can reach as high as 51 °C, fauna includes arachnids and rodents, while plants live throughout the Empty Quarter. As an ecoregion, the Rub al Khali falls within the Arabian Desert, the Asiatic cheetahs, once widespread in Saudi Arabia, are regionally extinct from the desert. Geologically, the Empty Quarter is the most oil-rich site in the world, vast oil reserves have been discovered underneath the sand dunes. Sheyba, at the edge of the Rub al Khali, is a major light crude oil-producing site in Saudi Arabia
25.
Diurnal temperature variation
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Atmospheric temperature range is the numerical difference between the minimum and maximum values of temperature observed in a given location during a period of time or the average. The variation in temperature occurs from the highs of the day to the cool of nights is called diurnal temperature variation. Average yearly temperature is 22.4 degrees Celsius, ranging from a minimum of 12.2 degrees to a maximum of 29.9 degrees. The average temperature range is 11.4 degrees, variability along the year is small. It is easy to see in the graph another typical phenomenon of temperature ranges, in Campinas, for example, the daily temperature range in July may vary between typically 10 and 24 degrees Celsius, while in January, it may range between 20 and 30 degrees Celsius. The effect of latitude, tropical climate, constant gentle wind and sea-side locations show smaller average temperature ranges, smaller variations of temperature, average maximum yearly temperature is 28.7 degrees Celsius and average minimum is 21.9. The average temperature range is 5.7 degrees only, temperature variation along the year in Aracaju is very damped. Most of the places with these characteristics are located in the transition between temperate and tropical climates, approximately around the tropics, particularly in the Southern hemisphere, the minimum temperature at night does not occur on the ground but few tens of centimeters above the ground. The phenomenon is attributed to the interaction of radiation effects on atmospheric aerosols
26.
Celsius
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Celsius, also known as centigrade, is a metric scale and unit of measurement for temperature. As an SI derived unit, it is used by most countries in the world and it is named after the Swedish astronomer Anders Celsius, who developed a similar temperature scale. The degree Celsius can refer to a temperature on the Celsius scale as well as a unit to indicate a temperature interval. Before being renamed to honour Anders Celsius in 1948, the unit was called centigrade, from the Latin centum, which means 100, and gradus, which means steps. The scale is based on 0° for the point of water. This scale is widely taught in schools today, by international agreement the unit degree Celsius and the Celsius scale are currently defined by two different temperatures, absolute zero, and the triple point of VSMOW. This definition also precisely relates the Celsius scale to the Kelvin scale, absolute zero, the lowest temperature possible, is defined as being precisely 0 K and −273.15 °C. The temperature of the point of water is defined as precisely 273.16 K at 611.657 pascals pressure. This definition fixes the magnitude of both the degree Celsius and the kelvin as precisely 1 part in 273.16 of the difference between absolute zero and the point of water. Thus, it sets the magnitude of one degree Celsius and that of one kelvin as exactly the same, additionally, it establishes the difference between the two scales null points as being precisely 273.15 degrees. In his paper Observations of two persistent degrees on a thermometer, he recounted his experiments showing that the point of ice is essentially unaffected by pressure. He also determined with precision how the boiling point of water varied as a function of atmospheric pressure. He proposed that the point of his temperature scale, being the boiling point. This pressure is known as one standard atmosphere, the BIPMs 10th General Conference on Weights and Measures later defined one standard atmosphere to equal precisely 1013250dynes per square centimetre. On 19 May 1743 he published the design of a mercury thermometer, in 1744, coincident with the death of Anders Celsius, the Swedish botanist Carolus Linnaeus reversed Celsiuss scale. In it, Linnaeus recounted the temperatures inside the orangery at the University of Uppsala Botanical Garden, since the 19th century, the scientific and thermometry communities worldwide referred to this scale as the centigrade scale. Temperatures on the scale were often reported simply as degrees or. More properly, what was defined as centigrade then would now be hectograde.2 gradians, for scientific use, Celsius is the term usually used, with centigrade otherwise continuing to be in common but decreasing use, especially in informal contexts in English-speaking countries
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Fahrenheit
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Fahrenheit is a temperature scale based on one proposed in 1724 by the physicist Daniel Gabriel Fahrenheit, after whom the scale is named. It uses the degree Fahrenheit as the unit, several accounts of how he originally defined his scale exist. The lower defining point,0 °F, was established as the temperature of a solution of brine made from parts of ice. Further limits were established as the point of ice and his best estimate of the average human body temperature. All other countries in the world now use the Celsius scale, defined since 1954 by absolute zero being −273.15 °C, on the Fahrenheit scale, the freezing point of water is 32 degrees Fahrenheit and the boiling point is 212 °F. This puts the boiling and freezing points of water exactly 180 degrees apart, therefore, a degree on the Fahrenheit scale is 1⁄180 of the interval between the freezing point and the boiling point. On the Celsius scale, the freezing and boiling points of water are 100 degrees apart, a temperature interval of 1 °F is equal to an interval of 5⁄9 degrees Celsius. The Fahrenheit and Celsius scales intersect at −40°, absolute zero is −273.15 °C or −459.67 °F. For an exact conversion, the formulas can be applied. Again, f is the value in Fahrenheit and c the value in Celsius, f °Fahrenheit to c °Celsius, C °Celsius to f °Fahrenheit, −40 = f. Fahrenheit proposed his temperature scale in 1724, basing it on two points of temperature. In his initial scale, the point is determined by placing the thermometer in a mixture of ice, water. This is a mixture which stabilizes its temperature automatically, that stable temperature was defined as 0 °F. The second point,96 degrees, was approximately the human bodys temperature, in any case, the definition of the Fahrenheit scale has changed since. According to a letter Fahrenheit wrote to his friend Herman Boerhaave, his scale was built on the work of Ole Rømer, whom he had met earlier. In Rømers scale, brine freezes at zero, water freezes and melts at 7.5 degrees, body temperature is 22.5, Fahrenheit multiplied each value by four in order to eliminate fractions and increase the granularity of the scale. Fahrenheit observed that water boils at about 212 degrees using this scale, under this system, the Fahrenheit scale is redefined slightly so that the freezing point of water is exactly 32 °F, and the boiling point is exactly 212 °F or 180 degrees higher. It is for this reason that human body temperature is approximately 98° on the revised scale
28.
Sorghum
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Sorghum is a genus of flowering plants in the grass family Poaceae. Seventeen of the species are native to Australia, with the range of some extending to Africa, Asia, Mesoamerica. One species is grown for grain, while others are used as fodder plants, either intentionally cultivated or allowed to grow naturally. The plants are cultivated in warm climates worldwide and naturalized in many places, Sorghum is in the subfamily Panicoideae and the tribe Andropogoneae. One species, Sorghum bicolor, native to Africa with many cultivated forms now, is an important crop worldwide, used for food, animal fodder, the production of alcoholic beverages, and biofuels. Most varieties are drought- and heat-tolerant, and are important in arid regions. These varieties form important components of pastures in many tropical regions, S. bicolor is an important food crop in Africa, Central America, and South Asia, and is the fifth-most important cereal crop grown in the world. Some species of sorghum can contain levels of cyanide, hordenine. When stressed by drought or heat, plants can contain toxic levels of cyanide and/or nitrates at later stages in growth. Another Sorghum species, Johnson grass, is classified as a species in the US by the Department of Agriculture. Sorghum is efficient in converting solar energy to chemical energy, biofuel, using sweet sorghum as a high sugar content from its stalk for ethanol production, is being developed with biomass which can be turned into charcoal, syngas, and bio-oil. In a 100 gram amount, raw sorghum provides 329 calories, 72% carbohydrates, 4% fat and 11% protein. Sorghum supplies numerous essential nutrients in rich content, including protein, fiber, the B vitamins, niacin, thiamin and vitamin B6, Sorghum nutrient contents generally are similar to those of raw oats. Among other similarities to oats, sorghum contains no gluten, making it useful for gluten-free diets, Agricultural Innovation in the Early Islamic World, The Diffusion of Crops and Farming Techniques, 700–1100. Species Profile- Johnsongrass, National Invasive Species Information Center, United States National Agricultural Library, lists general information and resources for Johnsongrass
29.
Coffee
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Coffee is a brewed drink prepared from roasted coffee beans, which are the seeds of berries from the Coffea plant. The genus Coffea is native to tropical Africa, and Madagascar, the two most commonly grown are the highly regarded arabica, and the less sophisticated but stronger and more hardy robusta. Once ripe, coffee berries are picked, processed, and dried, dried coffee seeds are roasted to varying degrees, depending on the desired flavor. Roasted beans are ground and brewed with boiling water to produce coffee as a beverage. Coffee is slightly acidic and can have an effect on humans because of its caffeine content. Coffee is one of the most popular drinks in the world and it can be prepared and presented in a variety of ways. It is usually served hot, although iced coffee is also served, the earliest credible evidence of coffee-drinking appears in the middle of the 15th century in the Sufi shrines of Yemen. It was here in Arabia that coffee seeds were first roasted and brewed in a way to how it is now prepared. Coffee seeds were first exported from East Africa to Yemen, as the coffea arabica plant is thought to have been indigenous to the former, yemeni traders took coffee back to their homeland and began to cultivate the seed. By the 16th century, it had reached Persia, Turkey, from there, it spread to Europe and the rest of the world. Coffee is an export commodity, it is the top agricultural export for numerous countries and is among the worlds largest legal agricultural exports. It is one of the most valuable commodities exported by developing countries, green coffee is one of the most traded agricultural commodities in the world. Consequently, the markets for fair trade coffee and organic coffee are expanding. The first reference to coffee in the English language is in the form chaona, dated to 1598 and understood to be a misprint of chaoua, equivalent, in the orthography of the time, to chaova. This term and coffee both derive from the Ottoman Turkish kahve, by way of the Italian caffè and it has also been proposed that the source may be the Proto-Central Semitic root q-h-h meaning dark. Alternatively, the word Khat, a plant widely used as stimulant in Yemen and Ethiopia before being supplanted by coffee has been suggested as a possible origin, the expression coffee break was first attested in 1952. The term coffee pot dates from 1705, other accounts attribute the discovery of coffee to Sheikh Omar. According to the ancient chronicle, Omar, who was known for his ability to cure the sick through prayer, was exiled from Mocha in Yemen to a desert cave near Ousab
30.
Sea level
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Mean sea level is an average level of the surface of one or more of Earths oceans from which heights such as elevations may be measured. A common and relatively straightforward mean sea-level standard is the midpoint between a low and mean high tide at a particular location. Sea levels can be affected by factors and are known to have varied greatly over geological time scales. The careful measurement of variations in MSL can offer insights into ongoing climate change, the term above sea level generally refers to above mean sea level. Precise determination of a sea level is a difficult problem because of the many factors that affect sea level. Sea level varies quite a lot on several scales of time and this is because the sea is in constant motion, affected by the tides, wind, atmospheric pressure, local gravitational differences, temperature, salinity and so forth. The easiest way this may be calculated is by selecting a location and calculating the mean sea level at that point, for example, a period of 19 years of hourly level observations may be averaged and used to determine the mean sea level at some measurement point. One measures the values of MSL in respect to the land, hence a change in MSL can result from a real change in sea level, or from a change in the height of the land on which the tide gauge operates. In the UK, the Ordnance Datum is the sea level measured at Newlyn in Cornwall between 1915 and 1921. Prior to 1921, the datum was MSL at the Victoria Dock, in Hong Kong, mPD is a surveying term meaning metres above Principal Datum and refers to height of 1. 230m below the average sea level. In France, the Marégraphe in Marseilles measures continuously the sea level since 1883 and it is used for a part of continental Europe and main part of Africa as official sea level. Elsewhere in Europe vertical elevation references are made to the Amsterdam Peil elevation, satellite altimeters have been making precise measurements of sea level since the launch of TOPEX/Poseidon in 1992. A joint mission of NASA and CNES, TOPEX/Poseidon was followed by Jason-1 in 2001, height above mean sea level is the elevation or altitude of an object, relative to the average sea level datum. It is also used in aviation, where some heights are recorded and reported with respect to sea level, and in the atmospheric sciences. An alternative is to base height measurements on an ellipsoid of the entire Earth, in aviation, the ellipsoid known as World Geodetic System 84 is increasingly used to define heights, however, differences up to 100 metres exist between this ellipsoid height and mean tidal height. The alternative is to use a vertical datum such as NAVD88. When referring to geographic features such as mountains on a topographic map, the elevation of a mountain denotes the highest point or summit and is typically illustrated as a small circle on a topographic map with the AMSL height shown in metres, feet or both. In the rare case that a location is below sea level, for one such case, see Amsterdam Airport Schiphol
31.
Morocco
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Morocco, officially known as the Kingdom of Morocco, is a sovereign country located in the Maghreb region of North Africa. Geographically, Morocco is characterized by a mountainous interior, large tracts of desert. Morocco has a population of over 33.8 million and an area of 446,550 km2 and its capital is Rabat, and the largest city is Casablanca. Other major cities include Marrakesh, Tangier, Tetouan, Salé, Fes, Agadir, Meknes, Oujda, Kenitra, a historically prominent regional power, Morocco has a history of independence not shared by its neighbours. Marinid and Saadi dynasties continued the struggle against foreign domination, the Alaouite dynasty, the current ruling dynasty, seized power in 1666. In 1912 Morocco was divided into French and Spanish protectorates, with a zone in Tangier. Moroccan culture is a blend of Arab, indigenous Berber, Sub-Saharan African, Morocco claims the non-self-governing territory of Western Sahara as its Southern Provinces. Morocco annexed the territory in 1975, leading to a war with indigenous forces until a cease-fire in 1991. Peace processes have thus far failed to break the political deadlock, Morocco is a constitutional monarchy with an elected parliament. The King of Morocco holds vast executive and legislative powers, especially over the military, foreign policy, the king can issue decrees called dahirs which have the force of law. He can also dissolve the parliament after consulting the Prime Minister, Moroccos predominant religion is Islam, and the official languages are Arabic and Tamazight. The Moroccan dialect, referred to as Darija, and French are also widely spoken, Morocco is a member of the Arab League, the Union for the Mediterranean, and the African Union. It has the fifth largest economy of Africa, the full Arabic name al-Mamlakah al-Maghribiyyah translates to Kingdom of the West, although the West in Arabic is الغرب Al-Gharb. The basis of Moroccos English name is Marrakesh, its capital under the Almoravid dynasty, the origin of the name Marrakesh is disputed, but is most likely from the Berber words amur akush or Land of God. The modern Berber name for Marrakesh is Mṛṛakc, in Turkish, Morocco is known as Fas, a name derived from its ancient capital of Fes. The English name Morocco is an anglicisation of the Spanish Marruecos, the area of present-day Morocco has been inhabited since Paleolithic times, sometime between 190,000 and 90,000 BC. During the Upper Paleolithic, the Maghreb was more fertile than it is today, twenty-two thousand years ago, the Aterian was succeeded by the Iberomaurusian culture, which shared similarities with Iberian cultures. Skeletal similarities have been suggested between the Iberomaurusian Mechta-Afalou burials and European Cro-Magnon remains, the Iberomaurusian was succeeded by the Beaker culture in Morocco
32.
Toubkal
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Toubkal or Tubkal is a mountain peak in southwestern Morocco, located in the Toubkal National Park. At 4,167 metres, it is the highest peak in the Atlas Mountains, Anti Atlas and it is an ultra prominent peak located 63 km south of the city of Marrakesh, and is a popular destination for climbers. The first ascent by Europeans was on 12 June 1923 by the Marquis de Segonzac, Vincent Berger and Hubert Dolbeau, trekkers usually approach the mountain from the road-end village of Imlil. Qualified guides can be hired, as well as porters, to carry equipment, for experienced mountaineers, guides are not required for the normal route, as it is a moderate hike and orientation is not a problem. The normal route starts with a walk to the village of Aroumd. Past Aroumd a floodplain is crossed and the route follows the slope of the valley southwards. The valley bends to the east to the settlement of Sidi Chamharouch. It is possible to buy good meals in the Refuge du Toubkal, tents can be pitched near the refuges for a small charge. From that point a path crosses the stream, climbs a steep slope to the east and enters a valley. At the col the route left to the summit ridge of Jbel Toubkal. The 4, 167m summit is crowned with a pyramidal metal frame and views take in most of the Atlas. The ascent during the summer is non-technical yet moderately difficult, only complicated by steep and slippery scree slopes, sturdy boots and proper clothing are required, and trekking poles are helpful on the scree. An ice-axe may be needed on the remaining snowfields in the early summer, the ascent during the end of the winter and spring is more difficult. Crampons are necessary to ascend through the snow and - in some cases - ice and it is possible to climb the mountain in two days - first day up to the refuge, second day to the summit and back to Imlil. In summer the mountains can be dry, but are sometimes subject to storms. Although the temperature should remain above zero during the day, freezing conditions are possible over 3, in winter the mountains are covered in snow and ice, and can be prone to avalanches. Skiing is possible as the snow can lie to considerable depth, information about state of the route can be obtained at Marrakech tourist offices or at Imlil. Nearby villages of Asni, Ikkiss, Imlil and Tacheddirt, routes up Mount Toubkal Summitpost. org page about Jbel Toubkal Photo Gallery of Jebel Toubkal and the High Atlas Refuge information
33.
Nautical mile
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A nautical mile is a unit of measurement defined as exactly 1852 meters. Historically, it was defined as one minute of latitude, which is equivalent to one sixtieth of a degree of latitude. Today it is an SI derived unit, being rounded to a number of meters. The derived unit of speed is the knot, defined as one mile per hour. The geographical mile is the length of one minute of longitude along the Equator, there is no internationally agreed symbol. M is used as the abbreviation for the mile by the International Hydrographic Organization and by the International Bureau of Weights. NM is used by the International Civil Aviation Organization, nm is used by the U. S. National Oceanic and Atmospheric Administration. Nmi is used by the Institute of Electrical and Electronics Engineers, the word mile is from the Latin word for a thousand paces, mīlia. In 1617 the Dutch scientist Snell assessed the circumference of the Earth at 24,630 Roman miles, around that time British mathematician Edmund Gunter improved navigational tools including a new quadrant to determine latitude at sea. He reasoned that the lines of latitude could be used as the basis for a unit of measurement for distance, as one degree is 1/360 of a circle, one minute of arc is 1/21600 of a circle. These sexagesimal units originated in Babylonian astronomy, Gunter used Snells circumference to define a nautical mile as 6,080 feet, the length of one minute of arc at 48 degrees latitude.3 metres. Other countries measure the minute of arc at 45 degrees latitude, in 1929, the international nautical mile was defined by the First International Extraordinary Hydrographic Conference in Monaco as 1,852 meters. Imperial units and United States customary units used a definition of the nautical mile based on the Clarke Spheroid, the United States nautical mile was defined as 6,080.20 feet based in the Mendenhall Order foot of 1893. It was abandoned in favour of the nautical mile in 1954.181 meters. It was abandoned in 1970 and, legally, references to the unit are now converted to 1,853 meters. Conversion of units Orders of magnitude
34.
Mile
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The mile is an English unit of length of linear measure equal to 5,280 feet, or 1,760 yards, and standardised as exactly 1,609.344 metres by international agreement in 1959. The Romans divided their mile into 5,000 feet but the importance of furlongs in pre-modern England meant that the statute mile was made equivalent to 8 furlongs or 5,280 feet in 1593. This form of the mile then spread to the British-colonized nations who continue to employ the mile, the US Geological Survey now employs the metre for official purposes but legacy data from its 1927 geodetic datum has meant that a separate US survey mile continues to see some use. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated as mph, mpg. The modern English word mile derives from Middle English myl and Old English mīl, the present international mile is usually what is understood by the unqualified term mile. When this distance needs to be distinguished from the nautical mile, in British English, the statute mile may refer to the present international miles or to any other form of English mile since the 1593 Act of Parliament which set it as a distance of 1,760 yards. Under American law, however, the statute mile refers to the US survey mile, the mile has been variously abbreviated—with and without a trailing period—as m, M, ml, and mi. The American National Institute of Standards and Technology now uses and recommends mi in order to avoid confusion with the SI metre and millilitre. Derived units such as miles per hour and miles per gallon, however, continue to be abbreviated in the United States, United Kingdom, the BBC style holds that There is no acceptable abbreviation for ‘miles’ and so it should be spelt out when used in describing areas. The Roman mile consisted of a thousand paces as measured by every other step—as in the distance of the left foot hitting the ground 1,000 times. The ancient Romans, marching their armies through uncharted territory, would push a carved stick in the ground after each 1000 paces. Well-fed and harshly driven Roman legionaries in good weather thus created longer miles, the distance was indirectly standardised by Agrippas establishment of a standard Roman foot in 29 BC, and the definition of a pace as 5 feet. An Imperial Roman mile thus denoted 5,000 Roman feet, surveyors and specialized equipment such as the decempeda and dioptra then spread its use. In modern times, Agrippas Imperial Roman mile was empirically estimated to have been about 1,481 metres in length, in Hellenic areas of the Empire, the Roman mile was used beside the native Greek units as equivalent to 8 stadia of 600 Greek feet. The mílion continued to be used as a Byzantine unit and was used as the name of the zero mile marker for the Byzantine Empire. The Roman mile also spread throughout Europe, with its local variations giving rise to the different units below, also arising from the Roman mile is the milestone. All roads radiated out from the Roman Forum throughout the Empire –50,000 miles of stone-paved roads, at every mile was placed a shaped stone, on which was carved a Roman numeral, indicating the number of miles from the center of Rome – the Forum. Hence, one knew how far one was from Rome
35.
Kilometre
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The kilometre or kilometer is a unit of length in the metric system, equal to one thousand metres. K is occasionally used in some English-speaking countries as an alternative for the kilometre in colloquial writing. A slang term for the kilometre in the US military is klick, there are two common pronunciations for the word. It is generally preferred by the British Broadcasting Corporation and the Australian Broadcasting Corporation, many scientists and other users, particularly in countries where the metric system is not widely used, use the pronunciation with stress on the second syllable. The latter pronunciation follows the pattern used for the names of measuring instruments. The problem with this reasoning, however, is that the meter in those usages refers to a measuring device. The contrast is more obvious in countries using the British rather than American spelling of the word metre. When Australia introduced the system in 1975, the first pronunciation was declared official by the governments Metric Conversion Board. However, the Australian prime minister at the time, Gough Whitlam, by the 8 May 1790 decree, the Constituent assembly ordered the French Academy of Sciences to develop a new measurement system. In August 1793, the French National Convention decreed the metre as the length measurement system in the French Republic. The first name of the kilometre was Millaire, although the metre was formally defined in 1799, the myriametre was preferred to the kilometre for everyday use. The term myriamètre appeared a number of times in the text of Develeys book Physique dEmile, ou, Principes de la de la nature. French maps published in 1835 had scales showing myriametres and lieues de Poste, the Dutch, on the other hand, adopted the kilometre in 1817 but gave it the local name of the mijl. It was only in 1867 that the term became the only official unit of measure in the Netherlands to represent 1000 metres. In the US, the National Highway System Designation Act of 1995 prohibits the use of highway funds to convert existing signs or purchase new signs with metric units. Although the State DOTs had the option of using metric measurements or dual units, all of them abandoned metric measurements, the Manual on Uniform Traffic Control Devices since 2000 is published in both metric and American Customary Units. Some sporting disciplines feature 1000 m races in major events, but in other disciplines, even though records are catalogued
36.
Coal
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Coal is a combustible black or brownish-black sedimentary rock usually occurring in rock strata in layers or veins called coal beds or coal seams. The harder forms, such as coal, can be regarded as metamorphic rock because of later exposure to elevated temperature and pressure. Coal is composed primarily of carbon, along with quantities of other elements, chiefly hydrogen, sulfur, oxygen. A fossil fuel, coal forms when plant matter is converted into peat, which in turn is converted into lignite, then sub-bituminous coal, after that bituminous coal. This involves biological and geological processes that take place over time, throughout history, coal has been used as an energy resource, primarily burned for the production of electricity and heat, and is also used for industrial purposes, such as refining metals. Coal is the largest source of energy for the generation of electricity worldwide, the extraction of coal, its use in energy production and its byproducts are all associated with environmental and health effects including climate change. Coal is extracted from the ground by coal mining, since 1983, the worlds top coal producer has been China. In 2015 China produced 3,747 million tonnes of coal –47. 7% of 7,861 million tonnes world coal production, in 2015 other large producers were United States, India, European Union and Australia. The word originally took the col in Old English, from Proto-Germanic *kula. In Old Turkic languages, kül is ash, cinders, öčür is quench, the compound charcoal in Turkic is öčür kül, literally quenched ashes, cinders, coals with elided anlaut ö- and inflection affixes -ülmüş. At various times in the geologic past, the Earth had dense forests in low-lying wetland areas, due to natural processes such as flooding, these forests were buried underneath soil. As more and more soil deposited over them, they were compressed, the temperature also rose as they sank deeper and deeper. As the process continued the plant matter was protected from biodegradation and oxidation and this trapped the carbon in immense peat bogs that were eventually covered and deeply buried by sediments. Under high pressure and high temperature, dead vegetation was slowly converted to coal, as coal contains mainly carbon, the conversion of dead vegetation into coal is called carbonization. The wide, shallow seas of the Carboniferous Period provided ideal conditions for coal formation, the exception is the coal gap in the Permian–Triassic extinction event, where coal is rare. Coal is known from Precambrian strata, which predate land plants — this coal is presumed to have originated from residues of algae, in its dehydrated form, peat is a highly effective absorbent for fuel and oil spills on land and water. It is also used as a conditioner for soil to make it able to retain. Lignite, or brown coal, is the lowest rank of coal, jet, a compact form of lignite, is sometimes polished and has been used as an ornamental stone since the Upper Palaeolithic
37.
Gold
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Gold is a chemical element with symbol Au and atomic number 79. In its purest form, it is a bright, slightly yellow, dense, soft, malleable. Chemically, gold is a metal and a group 11 element. It is one of the least reactive chemical elements and is solid under standard conditions, Gold often occurs in free elemental form, as nuggets or grains, in rocks, in veins, and in alluvial deposits. It occurs in a solid solution series with the element silver and also naturally alloyed with copper. Less commonly, it occurs in minerals as gold compounds, often with tellurium, golds atomic number of 79 makes it one of the higher numbered, naturally occurring elements. It is thought to have produced in supernova nucleosynthesis, from the collision of neutron stars. Because the Earth was molten when it was formed, almost all of the present in the early Earth probably sank into the planetary core. Gold is resistant to most acids, though it does dissolve in aqua regia, a mixture of acid and hydrochloric acid. Gold also dissolves in solutions of cyanide, which are used in mining and electroplating. Gold dissolves in mercury, forming amalgam alloys, but this is not a chemical reaction, as a precious metal, gold has been used for coinage, jewelry, and other arts throughout recorded history. A total of 186,700 tonnes of gold is in existence above ground, the world consumption of new gold produced is about 50% in jewelry, 40% in investments, and 10% in industry. Gold is also used in infrared shielding, colored-glass production, gold leafing, certain gold salts are still used as anti-inflammatories in medicine. As of 2014, the worlds largest gold producer by far was China with 450 tonnes, Gold is cognate with similar words in many Germanic languages, deriving via Proto-Germanic *gulþą from Proto-Indo-European *ǵʰelh₃-. The symbol Au is from the Latin, aurum, the Latin word for gold, the Proto-Indo-European ancestor of aurum was *h₂é-h₂us-o-, meaning glow. This word is derived from the root as *h₂éu̯sōs, the ancestor of the Latin word Aurora. This etymological relationship is presumably behind the frequent claim in scientific publications that aurum meant shining dawn, Gold is the most malleable of all metals, a single gram can be beaten into a sheet of 1 square meter, and an avoirdupois ounce into 300 square feet. Gold leaf can be thin enough to become semi-transparent
38.
Lead
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Lead is a chemical element with atomic number 82 and symbol Pb. When freshly cut, it is bluish-white, it tarnishes to a dull gray upon exposure to air and it is a soft, malleable, and heavy metal with a density exceeding that of most common materials. Lead has the second-highest atomic number of the stable elements. Lead is a relatively unreactive post-transition metal and its weak metallic character is illustrated by its amphoteric nature and tendency to form covalent bonds. Compounds of lead are found in the +2 oxidation state. Exceptions are mostly limited to organolead compounds, like the lighter members of the group, lead exhibits a tendency to bond to itself, it can form chains, rings, and polyhedral structures. Lead is easily extracted from its ores and was known to people in Western Asia. A principal ore of lead, galena, often bears silver, Lead production declined after the fall of Rome and did not reach comparable levels again until the Industrial Revolution. Nowadays, global production of lead is about ten million tonnes annually, Lead has several properties that make it useful, high density, low melting point, ductility, and relative inertness to oxidation. In the late 19th century, lead was recognized as poisonous, Lead is a neurotoxin that accumulates in soft tissues and bones, damaging the nervous system and causing brain disorders and, in mammals, blood disorders. A lead atom has 82 electrons, arranged in a configuration of 4f145d106s26p2. The combined first and second ionization energies—the total energy required to remove the two 6p electrons—is close to that of tin, leads upper neighbor in group 14. This is unusual since ionization energies generally fall going down a group as an elements outer electrons become more distant from the nucleus, the similarity is caused by the lanthanide contraction—the decrease in element radii from lanthanum to lutetium, and the relatively small radii of the elements after hafnium. The contraction is due to shielding of the nucleus by the lanthanide 4f electrons. The combined first four ionization energies of lead exceed those of tin, for this reason lead, unlike tin, mostly forms compounds in which it has an oxidation state of +2, rather than +4. Relativistic effects, which become particularly prominent at the bottom of the periodic table, as a result, the 6s electrons of lead become reluctant to participate in bonding, a phenomenon called the inert pair effect. A related outcome is that the distance between nearest atoms in crystalline lead is unusually long, the lighter group 14 elements form stable or metastable allotropes having the tetrahedrally coordinated and covalently bonded diamond cubic structure. The energy levels of their outer s- and p-orbitals are close enough to allow mixing into four hybrid sp3 orbitals
39.
Nickel
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Nickel is a chemical element with symbol Ni and atomic number 28. It is a silvery-white lustrous metal with a golden tinge. Nickel belongs to the metals and is hard and ductile. Meteoric nickel is found in combination with iron, a reflection of the origin of elements as major end products of supernova nucleosynthesis. An iron–nickel mixture is thought to compose Earths inner core, use of nickel has been traced as far back as 3500 BCE. Nickel was first isolated and classified as an element in 1751 by Axel Fredrik Cronstedt. The elements name comes from a mischievous sprite of German miner mythology, Nickel, an economically important source of nickel is the iron ore limonite, which often contains 1–2% nickel. Nickels other important ore minerals include garnierite, and pentlandite, major production sites include the Sudbury region in Canada, New Caledonia in the Pacific, and Norilsk in Russia. Nickel is slowly oxidized by air at room temperature and is considered corrosion-resistant, historically, it has been used for plating iron and brass, coating chemistry equipment, and manufacturing certain alloys that retain a high silvery polish, such as German silver. About 6% of world production is still used for corrosion-resistant pure-nickel plating. Nickel-plated objects sometimes provoke nickel allergy, Nickel has been widely used in coins, though its rising price has led to some replacement with cheaper metals in recent years. Nickel is one of four elements that are ferromagnetic around room temperature, alnico permanent magnets based partly on nickel are of intermediate strength between iron-based permanent magnets and rare-earth magnets. The metal is valuable in modern times chiefly in alloys, about 60% of world production is used in nickel-steels, other common alloys and some new superalloys comprise most of the remainder of world nickel use, with chemical uses for nickel compounds consuming less than 3% of production. As a compound, nickel has a number of chemical manufacturing uses. Nickel is a nutrient for some microorganisms and plants that have enzymes with nickel as an active site. Nickel is a metal with a slight golden tinge that takes a high polish. It is one of four elements that are magnetic at or near room temperature. Its Curie temperature is 355 °C, meaning that bulk nickel is non-magnetic above this temperature, the unit cell of nickel is a face-centered cube with the lattice parameter of 0.352 nm, giving an atomic radius of 0.124 nm
40.
Copper
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Copper is a chemical element with symbol Cu and atomic number 29. It is a soft, malleable, and ductile metal with high thermal and electrical conductivity. A freshly exposed surface of copper has a reddish-orange color. Copper is one of the few metals that occur in nature in directly usable metallic form as opposed to needing extraction from an ore and this led to very early human use, from c.8000 BC. Copper used in buildings, usually for roofing, oxidizes to form a green verdigris, Copper is sometimes used in decorative art, both in its elemental metal form and in compounds as pigments. Copper compounds are used as agents, fungicides, and wood preservatives. Copper is essential to all living organisms as a trace dietary mineral because it is a key constituent of the enzyme complex cytochrome c oxidase. In molluscs and crustaceans, copper is a constituent of the blood pigment hemocyanin, replaced by the hemoglobin in fish. In humans, copper is found mainly in the liver, muscle, the adult body contains between 1.4 and 2.1 mg of copper per kilogram of body weight. The filled d-shells in these elements contribute little to interatomic interactions, unlike metals with incomplete d-shells, metallic bonds in copper are lacking a covalent character and are relatively weak. This observation explains the low hardness and high ductility of single crystals of copper, at the macroscopic scale, introduction of extended defects to the crystal lattice, such as grain boundaries, hinders flow of the material under applied stress, thereby increasing its hardness. For this reason, copper is supplied in a fine-grained polycrystalline form. The softness of copper partly explains its high conductivity and high thermal conductivity. The maximum permissible current density of copper in open air is approximately 3. 1×106 A/m2 of cross-sectional area, Copper is one of a few metallic elements with a natural color other than gray or silver. Pure copper is orange-red and acquires a reddish tarnish when exposed to air, as with other metals, if copper is put in contact with another metal, galvanic corrosion will occur. A green layer of verdigris can often be seen on old structures, such as the roofing of many older buildings. Copper tarnishes when exposed to sulfur compounds, with which it reacts to form various copper sulfides. There are 29 isotopes of copper, 63Cu and 65Cu are stable, with 63Cu comprising approximately 69% of naturally occurring copper, both have a spin of 3⁄2
41.
United Nations
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The United Nations is an intergovernmental organization to promote international co-operation. A replacement for the ineffective League of Nations, the organization was established on 24 October 1945 after World War II in order to prevent another such conflict, at its founding, the UN had 51 member states, there are now 193. The headquarters of the UN is in Manhattan, New York City, further main offices are situated in Geneva, Nairobi, and Vienna. The organization is financed by assessed and voluntary contributions from its member states, the UNs mission to preserve world peace was complicated in its early decades by the Cold War between the US and Soviet Union and their respective allies. The organization participated in actions in Korea and the Congo. After the end of the Cold War, the UN took on major military, the UN has six principal organs, the General Assembly, the Security Council, the Economic and Social Council, the Secretariat, the International Court of Justice, and the UN Trusteeship Council. UN System agencies include the World Bank Group, the World Health Organization, the World Food Programme, UNESCO, the UNs most prominent officer is the Secretary-General, an office held by Portuguese António Guterres since 2017. Non-governmental organizations may be granted consultative status with ECOSOC and other agencies to participate in the UNs work, the organization won the Nobel Peace Prize in 2001, and a number of its officers and agencies have also been awarded the prize. Other evaluations of the UNs effectiveness have been mixed, some commentators believe the organization to be an important force for peace and human development, while others have called the organization ineffective, corrupt, or biased. Following the catastrophic loss of life in the First World War, the earliest concrete plan for a new world organization began under the aegis of the US State Department in 1939. It incorporated Soviet suggestions, but left no role for France, four Policemen was coined to refer to four major Allied countries, United States, United Kingdom, Soviet Union, and China, which emerged in the Declaration by United Nations. Roosevelt first coined the term United Nations to describe the Allied countries, the term United Nations was first officially used when 26 governments signed this Declaration. One major change from the Atlantic Charter was the addition of a provision for religious freedom, by 1 March 1945,21 additional states had signed. Each Government pledges itself to cooperate with the Governments signatory hereto, the foregoing declaration may be adhered to by other nations which are, or which may be, rendering material assistance and contributions in the struggle for victory over Hitlerism. During the war, the United Nations became the term for the Allies. To join, countries had to sign the Declaration and declare war on the Axis, at the later meetings, Lord Halifax deputized for Mr. Eden, Wellington Koo for T. V. Soong, and Mr Gromyko for Mr. Molotov. The first meetings of the General Assembly, with 51 nations represented, the General Assembly selected New York City as the site for the headquarters of the UN, and the facility was completed in 1952. Its site—like UN headquarters buildings in Geneva, Vienna, and Nairobi—is designated as international territory, the Norwegian Foreign Minister, Trygve Lie, was elected as the first UN Secretary-General
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Desertification
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Desertification is a type of land degradation in which relatively dry area of land becomes increasingly arid, typically losing its bodies of water as well as vegetation and wildlife. It is caused by a variety of factors, such as climate change. Desertification is a significant global ecological and environmental problem, considerable controversy exists over the proper definition of the term desertification for which Helmut Geist has identified more than 100 formal definitions. Another major contribution to the controversy comes from the sub-grouping of types of desertification, the worlds most noted deserts have been formed by natural processes interacting over long intervals of time. During most of times, deserts have grown and shrunk independent of human activities. Paleodeserts are large sand seas now inactive because they are stabilized by vegetation, some extending beyond the present margins of deserts, such as the Sahara. Drylands occupy approximately 40–41% of Earth’s land area and are home to more than 2 billion people. As of 1998, the then-current degree of expansion of the Sahara was not well known, due to a lack of recent. Causes of desertification in Sahel, The impact of global warming, in this area, the level of desertification is very high compared to other areas in the world. All areas situated in the part of Africa are characterized by a dry climate, hot temperatures. So, droughts are the rule in the Sahel region, development of the desertification process in Sahel, Some studies have shown that Africa has lost approximately 650000 km² of its productive agricultural land over the past 50 years. The propagation of desertification in this area is considerable, Some statistics have shown that since 1900, the Sahara has expanded by 250 km, covering an additional area of 6000 square kilometers. Impacts of desertification in Sahel, The survey, done by the institute for development, had demonstrated that this dryness is spreading fast in the Sahelian countries. Desertification in the Sahel can affect more than one billion of its inhabitants, 70% of the arid area has deteriorated and water resources have disappeared, leading to soil degradation. The loss of topsoil means that plants take root firmly. The United Nations Convention says that six million Sahelian citizens would have to give up the desertified zones of sub-Saharan Africa for North Africa. As the desertification takes place, the landscape may progress through different stages, on gradually sloped terrain, desertification can create increasingly larger empty spaces over a large strip of land, a phenomenon known as Brousse tigrée. A mathematical model of this phenomenon proposed by C, klausmeier attributes this patterning to dynamics in plant-water interaction
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Land degradation
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Land degradation is a process in which the value of the biophysical environment is affected by a combination of human-induced processes acting upon the land. It is viewed as any change or disturbance to the land perceived to be deleterious or undesirable, Natural hazards are excluded as a cause, however human activities can indirectly affect phenomena such as floods and bush fires. This is considered to be an important topic of the 21st century due to the land degradation has upon agronomic productivity, the environment. It is estimated that up to 40% of the agricultural land is seriously degraded. Land degradation is a term that can be applied differently across a wide range of scenarios. There are four ways of looking at land degradation and its impact on the environment around it. This can be seen through a loss of biomass, a loss of productivity or in potential productivity, or a loss or change in vegetative cover. Action in the capacity to provide resources for human livelihoods. This can be measured from a line of past land use. Loss of biodiversity, A loss of range of species or ecosystem complexity as a decline in the environmental quality, shifting ecological risk, increased vulnerability of the environment or people to destruction or crisis. This is measured through a line in the form of pre-existing risk of crisis or destruction. A problem with defining land degradation is that one group of people might view as degradation. Overall,36 types of land degradation can be assessed, all are induced or aggravated by human activities, e. g. sheet erosion, silting, aridification, salinization, urbanization, etc. Land degradation is a global problem largely related to agricultural use. g and this is frequent in semi-arid environments, where fuelwood shortages are often severe. It is a significant factor in Afghanistan, the growing population pressure, during 1980-1990, has led to decreases in the already small areas of agricultural land per person in six out of eight countries. Population pressure also operates through other mechanisms, high population density is not always related to land degradation. Rather, it is the practices of the population that can cause a landscape to become degraded. Populations can be a benefit to the land and make it more productive than it is in its natural state, Land degradation is an important factor of internal displacement in many African and Asian countries
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Biodiversity
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Biodiversity, a contraction of biological diversity, generally refers to the variety and variability of life on Earth. One of the most widely used definitions defines it in terms of the variability within species and it is a measure of the variety of organisms present in different ecosystems. This can refer to genetic variation, ecosystem variation, or species variation within an area, biome, terrestrial biodiversity tends to be greater near the equator, which seems to be the result of the warm climate and high primary productivity. Biodiversity is not distributed evenly on Earth, and is richest in the tropics and these tropical forest ecosystems cover less than 10 per cent of earths surface, and contain about 90 percent of the worlds species. Marine biodiversity tends to be highest along coasts in the Western Pacific, there are latitudinal gradients in species diversity. Biodiversity generally tends to cluster in hotspots, and has been increasing through time, the number and variety of plants, animals and other organisms that exist is known as biodiversity. It is a component of nature and it ensures the survival of human species by providing food, fuel, shelter, medicines. The richness of biodiversity depends on the conditions and area of the region. All species of plants taken together are known as flora and about 300,000 species of plants are known to date, all species of animals taken together are known as fauna which includes birds, mammals, fish, reptiles, insects, crustaceans, molluscs, etc. Rapid environmental changes typically cause mass extinctions, more than 99 percent of all species, amounting to over five billion species, that ever lived on Earth are estimated to be extinct. Estimates on the number of Earths current species range from 10 million to 14 million, of which about 1.2 million have been documented and over 86 percent have not yet been described. More recently, in May 2016, scientists reported that 1 trillion species are estimated to be on Earth currently with only one-thousandth of one percent described, the total amount of related DNA base pairs on Earth is estimated at 5.0 x 1037 and weighs 50 billion tonnes. In comparison, the mass of the biosphere has been estimated to be as much as 4 TtC. In July 2016, scientists reported identifying a set of 355 genes from the Last Universal Common Ancestor of all living on Earth. The age of the Earth is about 4.54 billion years old, there are microbial mat fossils found in 3.48 billion-year-old sandstone discovered in Western Australia. Other early physical evidence of a substance is graphite in 3.7 billion-year-old meta-sedimentary rocks discovered in Western Greenland. More recently, in 2015, remains of life were found in 4.1 billion-year-old rocks in Western Australia. According to one of the researchers, If life arose relatively quickly on Earth, then it could be common in the universe
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Comprehensive Nuclear-Test-Ban Treaty
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The Comprehensive Nuclear-Test-Ban Treaty is a multilateral treaty that bans all nuclear explosions, for both civilian and military purposes, in all environments. It was adopted by the United Nations General Assembly on 10 September 1996 but has not entered into force as eight specific states have not ratified the treaty. The movement for control of nuclear weapons began in 1945, with a call from Canada. The plan, which would serve as the basis for United States nuclear policy into the 1950s, was rejected by the Soviet Union as a US ploy to cement its nuclear dominance. Between the Trinity nuclear test of 16 July 1945 and the signing of the Partial Test Ban Treaty on 5 August 1963,499 nuclear tests were conducted. Between 1945 and 1963, the US conducted 215 atmospheric tests, the Soviet Union conducted 219, the UK conducted 21, and France conducted three. In 1954, following the Castle Bravo test, Prime Minister Jawaharlal Nehru of India issued the first appeal for an agreement on testing. Negotiations on a comprehensive test ban, primarily involved the US, UK, of primary concern throughout the negotiations, which would stretch with some interruptions to July 1963, was the system of verifying compliance with the test ban and detecting illicit tests. On the Western side, there were concerns that the Soviet Union would be able to circumvent any test ban and these fears were amplified following the US Rainier shot of 19 September 1957, which was the first contained underground test of a nuclear weapon. On the Soviet side, conversely, the on-site compliance inspections demanded by the US, disagreement over verification would lead to the Anglo-American and Soviet negotiators abandoning a comprehensive test ban in favor of a partial ban, which would be finalized on 25 July 1963. The PTBT, joined by 123 states following the three parties, banned detonations for military and civilian purposes underwater, in the atmosphere. On the one hand, enactment of the treaty was followed by a drop in the atmospheric concentration of radioactive particles. On the other hand, nuclear proliferation was not halted entirely, compared to the 499 tests from 1945 to the signing of the PTBT,436 tests were conducted over the ten years following the PTBT. Furthermore, US and Soviet underground testing continued venting radioactive gas into the atmosphere, additionally, though underground testing was generally safer than above-ground testing, underground tests continued to risk the leaking of radionuclides, including plutonium, into the ground. From 1964 through 1996, the year of the CTBTs adoption, the final non-underground test was conducted by China in 1980. The PTBT has been seen as a step towards the Nuclear Non-proliferation Treaty of 1968, under the NPT, non-nuclear weapon states were prohibited from possessing, manufacturing, and acquiring nuclear weapons or other nuclear explosive devices. All signatories, including nuclear weapon states, were committed to the goal of nuclear disarmament. In 1974, a step towards a comprehensive test ban was made with the Threshold Test Ban Treaty, ratified by the US and Soviet Union, which banned underground tests with yields above 150 kilotons
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Montreal Protocol
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It was agreed on 26 August 1987, and entered into force on 26 August 1989, followed by a first meeting in Helsinki, May 1989. Since then, it has undergone eight revisions, in 1990,1991,1992,1993,1995,1997,1998,1999 and 2016, as a result of the international agreement, the ozone hole in Antarctica is slowly recovering. Climate projections indicate that the layer will return to 1980 levels between 2050 and 2070. In this case of the ozone depletion challenge, there was global regulation already being installed before a consensus was established. Also, overall public opinion was convinced of possible imminent risks, the two ozone treaties have been ratified by 197 parties, which includes 196 states and the European Union, making them the first universally ratified treaties in United Nations history. The treaty is structured around groups of halogenated hydrocarbons that deplete stratospheric ozone. All of the ozone depleting substances controlled by the Montreal Protocol contain either chlorine or bromine, from 1996 its calculated level of consumption and production of the controlled substances in Group I of Annex A does not exceed zero. There was a faster phase-out of halon-1211, -2402, -1301, There was a slower phase-out of other substances, the phasing-out of the less damaging HCFCs only began in 1996 and will go on until a complete phasing-out is achieved by 2030. There were a few exceptions for essential uses, where no acceptable substitutes were found or Halon fire suppression systems used in submarines. They also agreed to start reducing its consumption and production in 2015, the time of freezing and reducing HCFCs is then known as 2013-2015. The HCFCs are transitional CFCs replacements, used as refrigerants, solvents, blowing agents for plastic foam manufacture, in terms of ozone depletion potential, in comparison to CFCs that have ODP0.6 –1.0, these HCFCs have lower ODPs. In terms of global warming potential, in comparison to CFCs that have GWP4,680 –10,720, produced mostly in developed countries, hydrofluorocarbons replaced CFCs and HCFCs. HFCs pose no harm to the ozone layer because, unlike CFCs and HCFCs and they are however greenhouse gases, with a high global warming potential, comparable to that of CFCs and HCFCs. Developed countries following the Kyoto Protocol report their HFC emission data to the UNFCCC, a group of developing countries including China, Brazil and South Africa are mandated to reduce their HFC use by 85 per cent of their average value in 2020-22 by the year 2045. In 1973, the chemists Frank Sherwood Rowland and Mario Molina, Rowland and Molina then proposed that these chlorine atoms might be expected to cause the breakdown of large amounts of ozone in the stratosphere. Their argument was based upon an analogy to contemporary work by Paul J. Crutzen and Harold Johnston, Crutzen, Molina and Rowland were awarded the 1995 Nobel Prize for Chemistry for their work on this problem. But the Rowland-Molina hypothesis was disputed by representatives of the aerosol. The chair of the board of DuPont was quoted as saying that ozone depletion theory is a fiction tale. a load of rubbish. utter nonsense. S
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Eritrea
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Eritrea, officially the State of Eritrea, is a country in the Horn of Africa. With its capital at Asmara, it is bordered by Sudan in the west, Ethiopia in the south, the northeastern and eastern parts of Eritrea have an extensive coastline along the Red Sea. The nation has an area of approximately 117,600 km2. Its toponym Eritrea is based on the Greek name for the Red Sea, Eritrea is a multi-ethnic country, with nine recognized ethnic groups in its population of around six million. Most residents speak languages from the Afroasiatic family, either of the Ethiopian Semitic languages or Cushitic branches, among these communities, the Tigrinya make up about 55% of the population, with the Tigre people constituting around 30% of inhabitants. In addition, there are a number of Nilo-Saharan-speaking Nilotic ethnic minorities, most people in the territory adhere to Christianity or Islam. In medieval times much of Eritrea fell under the Medri Bahri kingdom, the creation of modern-day Eritrea is a result of the incorporation of independent, distinct kingdoms and sultanates eventually resulting in the formation of Italian Eritrea. In 1947 Eritrea became part of a federation with Ethiopia, the Federation of Ethiopia, subsequent annexation into Ethiopia led to the Eritrean War of Independence, ending with Eritrean independence following a referendum in April 1993. Hostilities between Eritrea and Ethiopia persisted, leading to the Eritrean–Ethiopian War of 1998–2000 and further skirmishes with both Djibouti and Ethiopia, Eritrea is a one-party state in which national legislative elections have been repeatedly postponed. According to Human Rights Watch, the Eritrean governments human rights record is considered among the worst in the world, the Eritrean government has dismissed these allegations as politically motivated. The compulsory military service requires lengthy, indefinite conscription periods, which some Eritreans leave the country in order to avoid, since all local media is state-owned, Eritrea was also ranked as having the least press freedom in the global Press Freedom Index. Eritrea is a member of the African Union, the United Nations, and IGAD, during the Middle Ages, the Eritrea region was known as Medri Bahri. The name Eritrea is derived from the ancient Greek name for the Red Sea and it was first formally adopted in 1890, with the formation of Italian Eritrea. The territory became the Eritrea Governorate within Italian East Africa in 1936, Eritrea was annexed by Ethiopia in 1953 and an Eritrean Liberation Front formed in 1960. Eritrea gained independence following the 1993 referendum, and the name of the new state was defined as State of Eritrea in the 1997 constitution. At Buya in Eritrea, one of the oldest hominids representing a link between Homo erectus and an archaic Homo sapiens was found by Italian scientists. Dated to over 1 million years old, it is the oldest skeletal find of its kind, during the last interglacial period, the Red Sea coast of Eritrea was occupied by early anatomically modern humans. It is believed that the area was on the out of Africa that some scholars suggest was used by early humans to colonize the rest of the Old World
