Gondwana, was a supercontinent that existed from the Neoproterozoic until the Jurassic. It was formed by the accretion of several cratons. Gondwana became the largest piece of continental crust of the Paleozoic Era, covering an area of about 100,000,000 km2. During the Carboniferous Period, it merged with Laurussia to form a larger supercontinent called Pangaea. Gondwana broke up during the Mesozoic Era; the remnants of Gondwana make up about two thirds of today's continental area, including South America, Antarctica and the Indian Subcontinent. The formation of Gondwana began c. 800 to 650 Ma with the East African Orogeny, the collision of India and Madagascar with East Africa,and was completed c. 600 to 530 Ma with the overlapping Brasiliano and Kuunga orogenies, the collision of South America with Africa and the addition of Australia and Antarctica, respectively. The continent of Gondwana was named by Austrian scientist Eduard Suess, after the Gondwana region of central India, derived from Sanskrit for "forest of the Gonds".
The name had been used in a geological context, first by H. B. Medlicott in 1872, from which the Gondwana sedimentary sequences are described; the term "Gondwanaland" is preferred by some scientists in order to make a clear distinction between the region and the supercontinent. The assembly of Gondwana was a protracted process during the Neoproterozoic and Paleozoic, which however remains incompletely understood because of the lack of paleo-magnetic data. Several orogenies, collectively known as the Pan-African orogeny, led to the amalgamation of most of the continental fragments of a much older supercontinent, Rodinia. One of those orogenic belts, the Mozambique Belt, formed 800 to 650 Ma and was interpreted as the suture between East and West Gondwana. Three orogenies were recognized during the 1990s: the East African Orogeny and Kuunga orogeny, the collision between East Gondwana and East Africa in two steps, the Brasiliano orogeny, the successive collision between South American and African cratons.
The final stages of Gondwanan assembly overlapped with the opening of the Iapetus Ocean between Laurentia and western Gondwana. During this interval, the Cambrian explosion occurred. Laurentia was docked against the western shores of a united Gondwana for a short period near the Precambrian/Cambrian boundary, forming the short-lived and still disputed supercontinent Pannotia; the Mozambique Ocean separated the Congo–Tanzania–Bangweulu Block of central Africa from Neoproterozoic India. The Azania continent was an island in the Mozambique Ocean; the Australia/Mawson continent was still separated from India, eastern Africa, Kalahari by c. 600 Ma, when most of western Gondwana had been amalgamated. By c. 550 Ma, India had reached its Gondwanan position. Meanwhile, on the other side of the newly-forming Africa, Kalahari collided with Congo and Rio de la Plata which closed the Adamastor Ocean. C. 540–530 Ma, the closure of the Mozambique Ocean brought India next to Australia–East Antarctica, both North and South China were located in proximity to Australia.
As the rest of Gondwana formed, a complex series of orogenic events assembled the eastern parts of Gondwana c. 750 to 530 Ma. First the Arabian-Nubian Shield collided with eastern Africa in the East African Orogeny c.750 to 620 Ma. Australia and East Antarctica were merged with the remaining Gondwana c. 570 to 530 Ma in the Kuunga Orogeny. The Malagasy orogeny at about 550–515 Mya affected Madagascar, eastern East Africa and southern India. In it, Neoproterozoic India collided with the combined Azania and Congo–Tanzania–Bangweulu Block, suturing along the Mozambique Belt; the 18,000 km -long Terra Australis Orogen developed along Gondwana's western and eastern margins. Proto-Gondwanan Cambrian arc belts from this margin have been found in eastern Australia, New Zealand, Antarctica. Though these belts formed a continuous arc chain, the direction of subduction was different between the Australian-Tasmanian and New Zealand-Antarctica arc segments. A large number of terranes were accreted to Eurasia during Gondwana's existence but the Cambrian or Precambrian origin of many of these terranes remains uncertain.
For example, some Palaeozoic terranes and microcontinents that now make up Central Asia called the "Kazakh" and "Mongolian terranes", were progressively amalgamated into the continent Kazakhstania in the Late Silurian. Whether these blocks originated on the shores of Gondwana is not known. In the Early Palaeozoic the Armorican terrane, which today form large parts of France, was part of either Peri-Gondwana or core Gondwana. Precambrian rocks from the Iberian Peninsula suggest it too formed part of core Gondwana before its detachment as an orocline in the Variscan orogeny close to the Carboniferous–Permian boundary. South-east Asia is made of Gondwanan and Cathaysian continental fragments that were assembled during the Mid-Palaeozoic and Cenozoic; this p
Manihot esculenta called cassava, yuca, mandioca and Brazilian arrowroot, is a woody shrub native to South America of the spurge family, Euphorbiaceae. It is extensively cultivated as an annual crop in tropical and subtropical regions for its edible starchy tuberous root, a major source of carbohydrates. Though it is called yuca in Spanish and in the United States, it is not related to yucca, a shrub in the family Asparagaceae. Cassava, when dried to a powdery extract, is called tapioca. Cassava is the third-largest source of food carbohydrates in the tropics, after maize. Cassava is a major staple food in the developing world, providing a basic diet for over half a billion people, it is one of the most drought-tolerant crops, capable of growing on marginal soils. Nigeria is the world's largest producer of cassava, while Thailand is the largest exporter of dried cassava. Cassava is classified as either bitter. Like other roots and tubers, both bitter and sweet varieties of cassava contain antinutritional factors and toxins, with the bitter varieties containing much larger amounts.
It must be properly prepared before consumption, as improper preparation of cassava can leave enough residual cyanide to cause acute cyanide intoxication and ataxia, partial paralysis, or death. The more toxic varieties of cassava are a fall-back resource in times of famine or food insecurity in some places. Farmers prefer the bitter varieties because they deter pests and thieves; the cassava root is long and tapered, with a firm, homogeneous flesh encased in a detachable rind, about 1 mm thick and brown on the outside. Commercial cultivars can be 5 to 10 cm in diameter at the top, around 15 to 30 cm long. A woody vascular bundle runs along the root's axis; the flesh can be yellowish. Cassava roots are rich in starch and contain small amounts of calcium and vitamin C. However, they are poor in protein and other nutrients. In contrast, cassava leaves are a good source of protein, but deficient in the amino acid methionine and tryptophan. Wild populations of M. esculenta subspecies flabellifolia, shown to be the progenitor of domesticated cassava, are centered in west-central Brazil, where it was first domesticated no more than 10,000 years BP.
Forms of the modern domesticated species can be found growing in the wild in the south of Brazil. By 4,600 BC, manioc pollen appears in the Gulf of Mexico lowlands, at the San Andrés archaeological site; the oldest direct evidence of cassava cultivation comes from a 1,400-year-old Maya site, Joya de Cerén, in El Salvador. With its high food potential, it had become a staple food of the native populations of northern South America, southern Mesoamerica, the Caribbean by the time of European contact in 1492. Cassava was a staple food of pre-Columbian peoples in the Americas and is portrayed in indigenous art; the Moche people depicted yuca in their ceramics. Spaniards in their early occupation of Caribbean islands did not want to eat cassava or maize, which they considered insubstantial and not nutritious, they much preferred foods from Spain wheat bread, olive oil, red wine, meat, considered maize and cassava damaging to Europeans. For these Christians in the New World, cassava was not suitable for communion since it could not undergo transubstantiation and become the body of Christ.
"Wheat flour was the symbol of Christianity itself" and colonial-era catechisms stated explicitly that only wheat flour could be used. The cultivation and consumption of cassava was nonetheless continued in both Portuguese and Spanish America. Mass production of cassava bread became the first Cuban industry established by the Spanish, Ships departing to Europe from Cuban ports such as Havana, Santiago and Baracoa carried goods to Spain, but sailors needed to be provisioned for the voyage; the Spanish needed to replenish their boats with dried meat, water and large amounts of cassava bread. Sailors complained. Tropical Cuban weather was not suitable for wheat planting and cassava would not go stale as as regular bread. Cassava was introduced to Africa by Portuguese traders from Brazil in the 16th century. Around the same period, it was introduced to Asia through Columbian Exchange by Portuguese and Spanish traders, planted in their colonies in Goa, Eastern Indonesia and the Philippines. Maize and cassava are now important staple foods.
Cassava has become an important staple in Asia, extensively cultivated in Indonesia and Vietnam. Cassava is sometimes described as the "bread of the tropics" but should not be confused with the tropical and equatorial bread tree, the breadfruit or the African breadfruit. In 2016, global production of cassava root was 277 million tonnes, with Nigeria as the world's largest producer having 21% of the world total. Other major growers were Thailand and Indonesia. Cassava is one of the most drought-tolerant crops, can be grown on marginal soils, gives reasonable yields where many other crops do not grow well. Cassava is well adapted within latitudes 30° north and south of the equator, at elevations between sea level and 2,000 m above sea level, in equatorial temperatures, with rainfalls from 50 mm to 5 m annually, to poor soils with a pH ranging from acidic to alkaline; these conditions are common in certain parts of Africa and So
In the fields of horticulture and botany, the term deciduous means "falling off at maturity" and "tending to fall off", in reference to trees and shrubs that seasonally shed leaves in the autumn. The term deciduous means "the dropping of a part, no longer needed" and the "falling away after its purpose is finished". In plants, it is the result of natural processes. "Deciduous" has a similar meaning when referring to animal parts, such as deciduous antlers in deer, deciduous teeth in some mammals. Wood from deciduous trees is used in a variety of ways in several industries including lumber for furniture and flooring, bowling pins and baseball bats and furniture, cabinets and paneling. In botany and horticulture, deciduous plants, including trees and herbaceous perennials, are those that lose all of their leaves for part of the year; this process is called abscission. In some cases leaf loss coincides with winter -- namely in polar climates. In other parts of the world, including tropical and arid regions, plants lose their leaves during the dry season or other seasons, depending on variations in rainfall.
The converse of deciduous is evergreen, where foliage is shed on a different schedule from deciduous trees, therefore appearing to remain green year round. Plants that are intermediate may be called semi-deciduous. Other plants are semi-evergreen and lose their leaves before the next growing season, retaining some during winter or dry periods; some trees, including a few species of oak, have desiccated leaves that remain on the tree through winter. Many deciduous plants flower during the period when they are leafless, as this increases the effectiveness of pollination; the absence of leaves improves wind transmission of pollen for wind-pollinated plants and increases the visibility of the flowers to insects in insect-pollinated plants. This strategy is not without risks, as the flowers can be damaged by frost or, in dry season regions, result in water stress on the plant. There is much less branch and trunk breakage from glaze ice storms when leafless, plants can reduce water loss due to the reduction in availability of liquid water during cold winter days.
Leaf drop or abscission involves complex physiological changes within plants. The process of photosynthesis degrades the supply of chlorophylls in foliage; when autumn arrives and the days are shorter or when plants are drought-stressed, deciduous trees decrease chlorophyll pigment production, allowing other pigments present in the leaf to become apparent, resulting in non-green colored foliage. The brightest leaf colors are produced when days grow short and nights are cool, but remain above freezing; these other pigments include carotenoids that are yellow and orange. Anthocyanin pigments produce red and purple colors, though they are not always present in the leaves. Rather, they are produced in the foliage in late summer, when sugars are trapped in the leaves after the process of abscission begins. Parts of the world that have showy displays of bright autumn colors are limited to locations where days become short and nights are cool. In other parts of the world, the leaves of deciduous trees fall off without turning the bright colors produced from the accumulation of anthocyanin pigments.
The beginnings of leaf drop starts when an abscission layer is formed between the leaf petiole and the stem. This layer is formed in the spring during active new growth of the leaf; the cells are sensitive to a plant hormone called auxin, produced by the leaf and other parts of the plant. When auxin coming from the leaf is produced at a rate consistent with that from the body of the plant, the cells of the abscission layer remain connected; the elongation of these cells break the connection between the different cell layers, allowing the leaf to break away from the plant. It forms a layer that seals the break, so the plant does not lose sap. A number of deciduous plants remove nitrogen and carbon from the foliage before they are shed and store them in the form of proteins in the vacuoles of parenchyma cells in the roots and the inner bark. In the spring, these proteins are used as a nitrogen source during the growth of new leaves or flowers. Plants with deciduous foliage have advantages and disadvantages compared to plants with evergreen foliage.
Since deciduous plants lose their leaves to conserve water or to better survive winter weather conditions, they must regrow new foliage during the next suitable growing season. Evergreens suffer greater water loss during the winter and they can experience greater predation pressure when small. Losing leaves in winter may reduce damage from insects. Removing leaves reduces cavitation which can damage xylem vessels in plants; this allows deciduous plants to have xylem vessels with larger diameters and therefore a greater rate of transpiration during the summer growth period
The Neolithic, the final division of the Stone Age, began about 12,000 years ago when the first development of farming appeared in the Epipalaeolithic Near East, in other parts of the world. The division lasted until the transitional period of the Chalcolithic from about 6,500 years ago, marked by the development of metallurgy, leading up to the Bronze Age and Iron Age. In Northern Europe, the Neolithic lasted until about 1700 BC, while in China it extended until 1200 BC. Other parts of the world remained broadly in the Neolithic stage of development, although this term may not be used, until European contact; the Neolithic comprises a progression of behavioral and cultural characteristics and changes, including the use of wild and domestic crops and of domesticated animals. The term Neolithic derives from the Greek νέος néos, "new" and λίθος líthos, "stone" meaning "New Stone Age"; the term was coined by Sir John Lubbock in 1865 as a refinement of the three-age system. Following the ASPRO chronology, the Neolithic started in around 10,200 BC in the Levant, arising from the Natufian culture, when pioneering use of wild cereals evolved into early farming.
The Natufian period or "proto-Neolithic" lasted from 12,500 to 9,500 BC, is taken to overlap with the Pre-Pottery Neolithic of 10,200–8800 BC. As the Natufians had become dependent on wild cereals in their diet, a sedentary way of life had begun among them, the climatic changes associated with the Younger Dryas are thought to have forced people to develop farming. By 10,200–8800 BC farming communities had arisen in the Levant and spread to Asia Minor, North Africa and North Mesopotamia. Mesopotamia is the site of the earliest developments of the Neolithic Revolution from around 10,000 BC. Early Neolithic farming was limited to a narrow range of plants, both wild and domesticated, which included einkorn wheat and spelt, the keeping of dogs and goats. By about 6900–6400 BC, it included domesticated cattle and pigs, the establishment of permanently or seasonally inhabited settlements, the use of pottery. Not all of these cultural elements characteristic of the Neolithic appeared everywhere in the same order: the earliest farming societies in the Near East did not use pottery.
In other parts of the world, such as Africa, South Asia and Southeast Asia, independent domestication events led to their own regionally distinctive Neolithic cultures, which arose independently of those in Europe and Southwest Asia. Early Japanese societies and other East Asian cultures used pottery before developing agriculture. In the Middle East, cultures identified as Neolithic began appearing in the 10th millennium BC. Early development occurred from there spread eastwards and westwards. Neolithic cultures are attested in southeastern Anatolia and northern Mesopotamia by around 8000 BC; the prehistoric Beifudi site near Yixian in Hebei Province, contains relics of a culture contemporaneous with the Cishan and Xinglongwa cultures of about 6000–5000 BC, neolithic cultures east of the Taihang Mountains, filling in an archaeological gap between the two Northern Chinese cultures. The total excavated area is more than 1,200 square yards, the collection of neolithic findings at the site encompasses two phases.
The Neolithic 1 period began around 10,000 BC in the Levant. A temple area in southeastern Turkey at Göbekli Tepe, dated to around 9500 BC, may be regarded as the beginning of the period; this site was developed by nomadic hunter-gatherer tribes, as evidenced by the lack of permanent housing in the vicinity, may be the oldest known human-made place of worship. At least seven stone circles, covering 25 acres, contain limestone pillars carved with animals and birds. Stone tools were used by as many as hundreds of people to create the pillars, which might have supported roofs. Other early PPNA sites dating to around 9500–9000 BC have been found in Jericho, West Bank, Gilgal in the Jordan Valley, Byblos, Lebanon; the start of Neolithic 1 overlaps the Heavy Neolithic periods to some degree. The major advance of Neolithic 1 was true farming. In the proto-Neolithic Natufian cultures, wild cereals were harvested, early seed selection and re-seeding occurred; the grain was ground into flour. Emmer wheat was domesticated, animals were herded and domesticated.
In 2006, remains of figs were discovered in a house in Jericho dated to 9400 BC. The figs are of a mutant variety that cannot be pollinated by insects, therefore the trees can only reproduce from cuttings; this evidence suggests that figs were the first cultivated crop and mark the invention of the technology of farming. This occurred centuries before the first cultivation of grains. Settlements became more permanent, with circular houses, much like those of the Natufians, with single rooms. However, these houses were for the first time made of mudbrick; the settlement had a surrounding stone wall and a stone tower. The wall served as protection from nearby groups, as protection from floods, or to keep animals penned; some of the enclosures suggest grain and meat storage. The Neolithic 2 began around 8800 BC according to the ASPRO chronology in the Levant; as with the PPNA dates, there are two versions from the same laboratories noted above. This system of terminology, however, is not convenient for southeast Anatolia and settlements of the middle Anatolia basin.
A settlement of 3,000 inhabitants was found in th
Timor is an island at the southern end of Maritime Southeast Asia, north of the Timor Sea. The island is divided between the sovereign states of East Timor on the eastern part and Indonesia on the western part; the Indonesian part known as West Timor, constitutes part of the province of East Nusa Tenggara. Within West Timor lies an exclave of East Timor called Oecusse District; the island covers an area of 30,777 square kilometres. The name is a variant of timur, Malay for "east". Mainland Australia is less than 500 separated by the mentioned Timor Sea. Anthropologists identify eleven distinct ethno-linguistic groups in Timor; the largest are the Atoni of western Timor, the Tetum of central and eastern Timor. Most indigenous Timorese languages belong to the Timor–Babar branch of the Austronesian languages spoken throughout the Indonesian archipelago. Although lexical evidence is lacking, the non-Austronesian languages of Timor are thought to be related to languages spoken on Halmahera and in Western New Guinea.
Some are so mixed. The official languages of East Timor are Portuguese, while in West Timor it is Indonesian. Indonesian is widely spoken and understood in East Timor. Christianity is the dominant religion throughout the island of Timor, at about 90% of the population, but unequally distributed as West Timor is 58% Protestant and 37% Catholic, East Timor is 98% Catholic and 1% Protestant. Islam and animism make up most of the remainder at about 5% each across the island. Timor is located north of Australia, is one of the easternmost Sunda Islands. Together with Sumba and associated smaller islands, Timor forms the southern outer archipelago of the Lesser Sunda Islands with the inner islands of Flores and Wetar to the north, beyond them Sulawesi. Timor is the principal island of the Outer Banda Arc, upthrust by collision with the Australian continent. Timor lacks the volcanic nature of the northern Lesser Sunda Islands; the orientation of the main axis of the island differs from its neighbors. These features have been explained as the result of being on the northern edge of the Indo-Australian Plate as it meets the Eurasian Plate and pushes into South East Asia.
The climate includes a long dry season with hot winds blowing over from Australia. Rivers on the island include the Northern Laclo Rivers in East Timor; the largest towns on the island are the provincial capital of Kupang in West Timor and the Portuguese colonial towns of Dili the capital, Baucau in East Timor. Poor roads make transport to inland areas difficult, in East Timor especially. East Timor is a poor country, with health issues including dengue fever. Sources of revenue include oil in the Timor Sea, coffee growing and tourism. Timor and its offshore islands such as Atauro, a former place of exile known for its beaches and coral, as well as Jaco along with Wetar and the other Barat Daya Islands to the northeast constitute the Timor and Wetar deciduous forests ecoregion; the natural vegetation was tropical dry broadleaf forests with an undergrowth of shrubs and grasses supporting a rich wildlife. However much of the original forest has been cleared for farming on the coasts of Timor and on the smaller islands like Atauro.
Apart from one large block in the centre of Timor only patches remain. This ecoregion is part of the Wallacea area with a mixture of plants and animals of Asian and Australasian origin. Many trees are deciduous or deciduous, dropping their leaves during the dry season, there are evergreen and thorn trees in the woodland. Typical trees of the lowland slopes include Sterculia foetida, Calophyllum teysmannii and Aleurites moluccanus. During the Pleistocene epoch, Timor was the abode of extinct giant monitor lizards similar to the Komodo dragon. Like Flores and Sulawesi, Timor was once a habitat of extinct dwarf stegodonts, relatives of elephants. Fauna of today includes a number of endemic species such as the distinctive Timor shrew and Timor rat; the northern common cuscus, a marsupial of Australasian origin occurs as well, but is thought to be introduced. The island have a great number of birds of Asian origin with some of Australasian origin. There is a total of 250 species of which twenty four are endemic, due to the relative isolation of Timor, including five threatened species.
Saltwater crocodiles are found in the wetlands whereas reticulated pythons can be found in forests and grasslands of Timor. However, the population sizes and status are unknown. Frog species in Timor include Duttaphrynus melanostictus, Hoplobatrachus tigerinus, Limnonectes timorensis, Litoria everetti, Polypedates leucomystax. A new species of microlyhid frog belonging to the genus Kaloula has recently been discovered in Timor. Late Cretaceous fossils of marine vertebrates are known from East Timor deposits; these include mosasaurs such as Globidens timorensis, lamniforme sharks and the choristodere Champsosaurus. The earliest historical record about Timor island is the 14th-century Nagarakretagama, Canto 14, that identifies Timur as an island within Majapahit's realm. Timor was incorporated into ancient Javanese and Indian trading networks of the 14th century as an exporter of aromatic sandalwood, slaves and wax, was settled by both the Portuguese, in the end of the 16th century, the Dutch, based in Kupang, in the mid-17th century.
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The Sumba people are an ethnic group inhabiting Sumba Island, divided by two regencies, namely West Sumba Regency and East Sumba Regency. They refer to themselves as Tau Humba; the Sumbese have been able to retain much of their culture despite foreign influences that arrived long ago on the Lesser Sunda Islands. There are those of the Sawu Island. According to a myth of origin, they come from Hawu Meha and Humba Meha. Hawu Meha gave birth to the Sawunese who lived in Sumba Island but migrated to the small Sawu Island; the offspring of Humba Meha remained in Sumba. The exact time Sumba Island begin to populate is not known. There were theories that Sumba Island's most ancient inhabitants of the Australoids assimilated with the Austronesian people. Proof of this was the appearance of the natives Sumba. However, genetic studies have shown that Sumba people are a little different from other Austronesian people and the Australoid features could have been taken by their ancestors on the way to the island.
According to the Marapu mythology, the first people down through the stairs from the sky to the north of the island. Geneticists claim that the ancestors of the Sumba people did inhabit the northern coast, only followed by the rest of the Sumba Island. Since the end of Neolithic period, settlers have created megalithic structures. Moreover, this tradition continued until the 20th century. In the Middle Ages, Sumba were active in trading valuable species of fragrant resin. Due to the merchants from Arabia to the island, new breed of horses were introduced; the dry climate of the local Tropical savanna climate contributed to the expansion of horse breeding. It is assumed that Sumba people were dependent on the Javanese kingdom of Majapahit from other kingdom relations in Sumbawa and Sulawesi. In fact, the power was divided with their never-ending struggle for power; this has resulted in the development of slavery. In 1866, Sumba was attached to the colonial possessions of the Dutch East India Company.
East of the island was influenced by the colonial administration, while the west side maintained an archaic lifestyle. After an uprising in 1901, the Dutch had a number of reforms aimed at modernizing the economy and the establishment of a single administration. In 1949, Sumba became part of independent Indonesia; the traditional religion of the Marapu religion, which includes both ancestral worship and deity worship is still much alive among the Sumbese society. Marapu is the philosophical center of Sumbese cultural expression and includes customary ceremonies, traditional places of worship, traditional architecture, decorative carvings and textiles with its fashion styles such as hinggi and lau fabric, as well as its jewelry and weapons. Christianity begin to spread in the 19th century with the arrival of Christian missionaries; the majority of Christian believers belong to the Protestants. The main occupation of Sumba people has long been agriculture. Dominated by slash-and-burn agriculture in the Tropical savanna climate, as well as livestock keeping.
The climate with regular seasonal droughts have led to the formation of a special agricultural strategy where farmers grow various crops at subsistence level such as rice, tuber, so on. However today it is not always bountiful but it helps to produce just good enough harvests; the traditional staple diet are cassava. Dutch missionaries and colonial officers have noted that hunger is a cause for military conflicts. Sumba people keep cows, chickens and horses; the locals breed a species of small but hardy horses, it is well known to other islands of Indonesia. Traditional crafts includes stone carving; the main type of settlement is village houses with their traditional defensive concept is to be built on hilltops and surrounded by dense thorny thickets. Frame bamboo huts are built on poles with walls overshadowing mats. Thatched roof has a complex structure designed to protect homes from rain and sun, as well as to provide natural ventilation in buildings; the social strata in East Sumba Regency among the nobles and the common folk still exists although it is not observed as as in the past and outwardly it is no longer seen in the physical appearance and the dress of a person.
Today differences in attire indicate different levels of importance during events such as traditional celebrations and death ceremonies, where components of the attire, used are newly made, while old or worn out clothing is used at home or for daily work. In the past, the main clothing was ornamented sarong ikat, where both men and women covered them only at the lower part of the body; the most important part of the traditional attire of Sumba is located on the body cover in the form of large sheets of hinggi fabric for men and lau fabric for women. From the hinggi and lau fabrics, made by weaving techniques and its application of muti and hada are revealed as various symbols in the social and economic context; the eastern part of the island of Sumba is the hub of trade relations where people are connected with the outside world. Therefore in the second half of 2 millennium AD, complex social structure are formed here with a layer of high ranking soldiers and leaders that took the monarch title, raja.
In western Sumba, only a small tribal groups are headed by selected leaders remained. In both parts of the island's main social role played by the major tribal communities, who occupied the village, controls the surrounding land and water sources, they were divided i
The Indian Ocean is the third largest of the world's 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, on the south by the Southern Ocean or, depending on definition, by Antarctica; the Indian Ocean is named after India. Called the Sindhu Mahasagara or the great sea of the Sindhu by the Ancient Indians, this ocean has been variously called Hindu Ocean, Indic Ocean, etc. in various languages. The Indian Ocean was known earlier as the Eastern Ocean; the term was still in use during the mid-18th century. The borders of the Indian Ocean, as delineated by the International Hydrographic Organization in 1953 included the Southern Ocean but not the marginal seas along the northern rim, but in 2000 the IHO delimited the Southern Ocean separately, which removed waters south of 60°S from the Indian Ocean, but included the northern marginal seas. Meridionally, the Indian Ocean is delimited from the Atlantic Ocean by the 20° east meridian, running south from Cape Agulhas, from the Pacific Ocean by the meridian of 146°49'E, running south from the southernmost point of Tasmania.
The northernmost extent of the Indian Ocean is 30° north in the Persian Gulf. The Indian Ocean covers 70,560,000 km2, including the Red Sea and the Persian Gulf but excluding the Southern Ocean, or 19.5% of the world's oceans. The ocean's continental shelves are narrow. An exception is found off Australia's western coast; the average depth of the ocean is 3,890 m. Its deepest point is Sunda Trench at a depth of 7,450 m. North of 50° south latitude, 86% of the main basin is covered by pelagic sediments, of which more than half is globigerina ooze; 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 and the Palk Strait. Seas include the Gulf of Aden, Andaman Sea, Arabian Sea, Bay of Bengal, Great Australian Bight, Laccadive Sea, Gulf of Mannar, Mozambique Channel, Gulf of Oman, Persian Gulf, Red Sea and other tributary water bodies.
The Indian Ocean is artificially connected to the Mediterranean Sea through the Suez Canal, accessible via the Red Sea. All of the Indian Ocean is in the Eastern Hemisphere and the centre of the Eastern Hemisphere, the 90th meridian east, passes through the Ninety East Ridge. Marginal seas, gulfs and straits of the Indian Ocean include: Several features make the Indian Ocean unique, it constitutes the core of the large-scale Tropical Warm Pool which, when interacting with the atmosphere, affects the climate both regionally and globally. Asia prevents the ventilation of the Indian Ocean thermocline; that continent drives the Indian Ocean monsoon, the strongest on Earth, which causes large-scale seasonal variations in ocean currents, including the reversal of the Somali Current and Indian Monsoon Current. Because of the Indian Ocean Walker circulation there is no continuous equatorial easterlies. Upwelling occurs near the Horn of Africa and the Arabian Peninsula in the Northern Hemisphere and north of the trade winds in the Southern Hemisphere.
The Indonesian Throughflow is a unique Equatorial connection to the Pacific. The climate north of the equator is affected by a monsoon climate. Strong north-east winds blow from October until April. In the Arabian Sea the violent Monsoon brings rain to the Indian subcontinent. In the southern hemisphere, the winds are milder, but summer storms near Mauritius can be severe; when the monsoon winds change, cyclones sometimes strike the shores of the Arabian Sea and the Bay of Bengal. The Indian Ocean is the warmest ocean in the world. Long-term ocean temperature records show a rapid, continuous warming in the Indian Ocean, at about 0.7–1.2 °C during 1901–2012. Indian Ocean warming is the largest among the tropical oceans, about 3 times faster than the warming observed in the Pacific. Research indicates that human induced greenhouse warming, changes in the frequency and magnitude of El Niño events are a trigger to this strong warming in the Indian Ocean. South of the Equator the Indian Ocean is gaining heat from June to October, during the austral winter, while it is losing heat from November to March, during the austral summer.
Among the few large rivers flowing into the Indian Ocean are the Zambezi and Jubba in Africa. The ocean's currents are controlled by the monsoon. Two large gyres, one in the northern hemisphere flowing clockwise and one south of the equator moving anticlockwise, constitute the dominant flow pattern. During the winter monsoon, circulation is reversed north of 30°S and winds are weakened during winter and the transitional periods between the monsoons. Deep water circulation is controlled by inflows from the Atlantic Ocean, the Red Sea, Antarctic currents. North of 20 ° south latitude the minimum surface temperature is 22 °C. Southward of 40° south latitude, temperatures