The Stirling Range or Koikyennuruff is a range of mountains and hills in the Great Southern region of Western Australia, 337 km south-east of Perth. It is over 60 km wide from west to east, stretching from the highway between Mount Barker and Cranbrook eastward past Gnowangerup; the Stirling Range is protected by the Stirling Range National Park, gazetted in 1913, has an area of 1,159 km2. The mountains are formed of metamorphic rock derived from sediments deposited during the Paleoproterozoic Era, between 2.0 and 1.2 billion years old. The sediments were subsequently metamorphosed to quartzites and shales 1.2 billion years ago, folded during reactivation of basement structures recording lateral displacements between Antarctica and Australia. Despite the relative youth of the mountains, the soils remain poor, creating the species-rich heathland flora; as the only vertical obstacle to weather in any direction, the range tends to alter weather patterns around itself. Its upper slopes receive more rainfall than surrounding areas.
The branch of the Kalgan River, which forms the southwestern border of the park, is fed in large part from precipitation falling in the western half of the range. The annual rainfall on the plains around the park is quite low compared with the rainy Porongurups to the south, averaging only 575 millimetres on the southern side and as little as 400 millimetres in Borden on the northern side. Although no rain gauges have been placed on the high peaks, the highest rainfall is estimated to be about 1000 mm near Coyanarup Peak and Bluff Knoll; this is supported by distinctly moist-climate pockets of vegetation in some high valleys. Most rain falls between May and August, with summer being frequently dry around Borden for over a month and having very light showers in the south and on the peaks. Temperatures in the lowlands are warm. In the summer, average maxima are around 30 °C in Borden and about 27 °C in the southern plains. Summer minima range from about 16 °C in the south to 18 °C in Borden. In the winter, maximum temperatures are a pleasant 16 °C and minima are about 8 °C.
On Bluff Knoll, winter temperatures range from maxima of about 11 °C to minima of 3 °C. These are the lowest temperatures in Western Australia and the Stirling Range receives snowfalls—the only place in Western Australia to do so, though it is light. Snow has been reported as early as April and as late as 19 November 1992, but is confined to the period from June to September; the range is one of the richest areas for flora in the world. The low-nutrient soils support five major vegetation communities: shrubland and mallee-heathland at higher altitudes. Ninety families, 384 genera, over 1500 plant species occur there, 87 of which are found nowhere else; this represents more than a third of the known flora of the southwest, includes more species of wildflowers than in the entire British Isles. The range has been identified by BirdLife International as an Important Bird Area because it supports populations of endangered short-billed black cockatoos and western whipbirds, is visited by endangered long-billed black-cockatoos.
Significant biome-restricted or range-restricted bird species found in the range include red-capped and regent parrots, western rosellas, rufous treecreepers, red-winged and blue-breasted fairywrens, purple-gaped honeyeaters, western spinebills, western thornbills, western yellow and white-breasted robins, red-eared firetails. The range is an important site for endemic mygalomorph spiders, for land snails; some 20 species of native mammals, including the reintroduced numbat, have been recorded. The plains in the Stirling Range region were the hunting grounds for small groups of Indigenous Australians for thousands of years before European settlement. At least two tribes frequented the area: the Qaaniyan people in the west, the Koreng people in the east; the Stirling Range played an important role in their culture, appearing in a number of Dreamtime stories. The first recorded sighting of the Stirling Ranges by a European explorer was by Matthew Flinders on 5 January 1802. While sailing along the south coast of Australia, just east of King George Sound, he noted at a distance of eight leagues inland a chain of rugged mountains, the easternmost of which he named Mount Rugged.
An army garrison was established at King George Sound in 1826, the following year the commanding officer, Major Edmund Lockyer, explored the land north of the Sound. On 11 February 1827, he observed in the distance mountains running west about 40 miles. Alexander Collie explored to the north of the Sound in 1831. On 29 April, he described recorded names for the main peaks; the following year, Robert Dale led an expedition to the Range. On 24 January 1832, he made the first recorded ascent of a peak in the Stirling Range, scaling Toolbrunup. Late in 1835, Governor James Stirling and John Septimus Roe led an expedition from Albany to Perth, they first saw the Stirling Ranges on 3 November, on travelling closer to them the following day, Roe gave them their name. Early exploitation of the Stirling Ranges included cutting of kangaroo hunting; the Ranges were never formally taken up for grazing because of the many poison bushes in the area. However, squatters ran sheep to the south of the Range in the 1850s, in the 1860s a selection was taken up at the base of Mount Trio.
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Great Britain is an island in the North Atlantic Ocean off the northwest coast of continental Europe. With an area of 209,331 km2, it is the largest of the British Isles, the largest European island, the ninth-largest island in the world. In 2011, Great Britain had a population of about 61 million people, making it the world's third-most populous island after Java in Indonesia and Honshu in Japan; the island of Ireland is situated to the west of Great Britain, together these islands, along with over 1,000 smaller surrounding islands, form the British Isles archipelago. The island is dominated by a maritime climate with quite narrow temperature differences between seasons. Politically, Great Britain is part of the United Kingdom of Great Britain and Northern Ireland, constitutes most of its territory. Most of England and Wales are on the island; the term "Great Britain" is used to include the whole of England and Wales including their component adjoining islands. A single Kingdom of Great Britain resulted from the union of the Kingdom of England and the Kingdom of Scotland by the 1707 Acts of Union.
In 1801, Great Britain united with the neighbouring Kingdom of Ireland, forming the United Kingdom of Great Britain and Ireland, renamed the "United Kingdom of Great Britain and Northern Ireland" after the Irish Free State seceded in 1922. The archipelago has been referred to by a single name for over 2000 years: the term'British Isles' derives from terms used by classical geographers to describe this island group. By 50 BC Greek geographers were using equivalents of Prettanikē as a collective name for the British Isles. However, with the Roman conquest of Britain the Latin term Britannia was used for the island of Great Britain, Roman-occupied Britain south of Caledonia; the earliest known name for Great Britain is Albion or insula Albionum, from either the Latin albus meaning "white" or the "island of the Albiones". The oldest mention of terms related to Great Britain was by Aristotle, or by Pseudo-Aristotle, in his text On the Universe, Vol. III. To quote his works, "There are two large islands in it, called the British Isles and Ierne".
Pliny the Elder in his Natural History records of Great Britain: "Its former name was Albion. Old French Bretaigne and Middle English Bretayne, Breteyne; the French form replaced the Old English Breoton, Bryten, Breten. Britannia was used by the Romans from the 1st century BC for the British Isles taken together, it is derived from the travel writings of the Pytheas around 320 BC, which described various islands in the North Atlantic as far north as Thule. Marcian of Heraclea, in his Periplus maris exteri, described the island group as αἱ Πρεττανικαὶ νῆσοι; the peoples of these islands of Prettanike were called the Priteni or Pretani. Priteni is the source of the Welsh language term Prydain, which has the same source as the Goidelic term Cruithne used to refer to the early Brythonic-speaking inhabitants of Ireland; the latter were called Picts or Caledonians by the Romans. Greek historians Diodorus of Sicily and Strabo preserved variants of Prettanike from the work of Greek explorer Pytheas of Massalia, who travelled from his home in Hellenistic southern Gaul to Britain in the 4th century BC.
The term used by Pytheas may derive from a Celtic word meaning "the painted ones" or "the tattooed folk" in reference to body decorations. The Greco-Egyptian scientist Ptolemy referred to the larger island as great Britain and to Ireland as little Britain in his work Almagest. In his work, Geography, he gave the islands the names Alwion and Mona, suggesting these may have been the names of the individual islands not known to him at the time of writing Almagest; the name Albion appears to have fallen out of use sometime after the Roman conquest of Britain, after which Britain became the more commonplace name for the island. After the Anglo-Saxon period, Britain was used as a historical term only. Geoffrey of Monmouth in his pseudohistorical Historia Regum Britanniae refers to the island as Britannia major, to distinguish it from Britannia minor, the continental region which approximates to modern Brittany, settled in the fifth and sixth centuries by migrants from Britain; the term Great Britain was first used in 1474, in the instrument drawing up the proposal for a marriage between Cecily the daughter of Edward IV of England, James the son of James III of Scotland, which described it as "this Nobill Isle, callit Gret Britanee".
It was used again in 1604, when King James VI and I styled himself "King of Great Brittaine and Ireland". Great Britain refers geographically to the island of Great Britain, it is often used to refer politically to the whole of England and Wales, including their smaller off shore islands. While it is sometimes used to refer to the whole of the United Kingdom, including Northern Ireland, this is not correct. Britain can refer to either all island
Antarctica is Earth's southernmost continent. It contains the geographic South Pole and is situated in the Antarctic region of the Southern Hemisphere entirely south of the Antarctic Circle, is surrounded by the Southern Ocean. At 14,200,000 square kilometres, it is the fifth-largest continent. For comparison, Antarctica is nearly twice the size of Australia. About 98% of Antarctica is covered by ice that averages 1.9 km in thickness, which extends to all but the northernmost reaches of the Antarctic Peninsula. Antarctica, on average, is the coldest and windiest continent, has the highest average elevation of all the continents. Most of Antarctica is a polar desert, with annual precipitation of only 200 mm along the coast and far less inland; the temperature in Antarctica has reached −89.2 °C, though the average for the third quarter is −63 °C. Anywhere from 1,000 to 5,000 people reside throughout the year at research stations scattered across the continent. Organisms native to Antarctica include many types of algae, fungi, plants and certain animals, such as mites, penguins and tardigrades.
Vegetation, where it occurs, is tundra. Antarctica is noted as the last region on Earth in recorded history to be discovered, unseen until 1820 when the Russian expedition of Fabian Gottlieb von Bellingshausen and Mikhail Lazarev on Vostok and Mirny sighted the Fimbul ice shelf; the continent, remained neglected for the rest of the 19th century because of its hostile environment, lack of accessible resources, isolation. In 1895, the first confirmed. Antarctica is a de facto condominium, governed by parties to the Antarctic Treaty System that have consulting status. Twelve countries signed the Antarctic Treaty in 1959, thirty-eight have signed it since then; the treaty prohibits military activities and mineral mining, prohibits nuclear explosions and nuclear waste disposal, supports scientific research, protects the continent's ecozone. Ongoing experiments are conducted by more than 4,000 scientists from many nations; the name Antarctica is the romanised version of the Greek compound word ἀνταρκτική, feminine of ἀνταρκτικός, meaning "opposite to the Arctic", "opposite to the north".
Aristotle wrote in his book Meteorology about an Antarctic region in c. 350 BC Marinus of Tyre used the name in his unpreserved world map from the 2nd century CE. The Roman authors Hyginus and Apuleius used for the South Pole the romanised Greek name polus antarcticus, from which derived the Old French pole antartike attested in 1270, from there the Middle English pol antartik in a 1391 technical treatise by Geoffrey Chaucer. Before acquiring its present geographical connotations, the term was used for other locations that could be defined as "opposite to the north". For example, the short-lived French colony established in Brazil in the 16th century was called "France Antarctique"; the first formal use of the name "Antarctica" as a continental name in the 1890s is attributed to the Scottish cartographer John George Bartholomew. The long-imagined south polar continent was called Terra Australis, sometimes shortened to'Australia' as seen in a woodcut illustration titled Sphere of the winds, contained in an astrological textbook published in Frankfurt in 1545.
Although the longer Latin phrase was better known, the shortened name Australia was used in Europe's scholarly circles. In the nineteenth century, the colonial authorities in Sydney removed the Dutch name from New Holland. Instead of inventing a new name to replace it, they took the name Australia from the south polar continent, leaving it nameless for some eighty years. During that period, geographers had to make do with clumsy phrases such as "the Antarctic Continent", they searched for a more poetic replacement, suggesting various names such as Antipodea. Antarctica was adopted in the 1890s. Antarctica has no indigenous population, there is no evidence that it was seen by humans until the 19th century. However, in February 1775, during his second voyage, Captain Cook called the existence of such a polar continent "probable" and in another copy of his journal he wrote:" believe it and it's more than probable that we have seen a part of it". However, belief in the existence of a Terra Australis—a vast continent in the far south of the globe to "balance" the northern lands of Europe and North Africa—had prevailed since the times of Ptolemy in the 1st century AD.
In the late 17th century, after explorers had found that South America and Australia were not part of the fabled "Antarctica", geographers believed that the continent was much larger than its actual size. Integral to the story of the origin of Antarctica's name is that it was not named Terra Australis—this name was given to Australia instead, because of the misconception that no significant landmass could exist further south. Explorer Matthew Flinders, in particular, has been credited with popularising the transfer of the name Terra Australis to Australia, he justified the titling of his book A Voyage to Terra Australis by writing in the introduction: There is no probability, that any other detached body of land, of nearly equal extent, will be found in a more southern latitude.
Shrubland, scrub, brush, or bush is a plant community characterised by vegetation dominated by shrubs also including grasses and geophytes. Shrubland may either occur or be the result of human activity, it may be the mature vegetation type in a particular region and remain stable over time, or a transitional community that occurs temporarily as the result of a disturbance, such as fire. A stable state may be maintained by regular natural disturbance such as browsing. Shrubland may be unsuitable for human habitation because of the danger of fire; the term "shrubland" was coined in 1903. Shrubland species show a wide range of adaptations to fire, such as heavy seed production and fire-induced germination. In botany and ecology a shrub is defined as a much-branched woody plant less than 8 m high and with many stems. Tall shrubs are 2–8 m high, small shrubs 1–2 m high and subshrubs less than 1 m high. A descriptive system adopted in Australia to describe different types of vegetation is based on structural characteristics based on plant life-form, plus the height and foliage cover of the tallest stratum or dominant species.
For shrubs 2–8 m high the following structural forms result: dense foliage cover — closed-scrub mid-dense foliage cover — open- sparse foliage cover — tall open shrublandFor shrubs <2 m high the following structural forms result: dense foliage cover — closed-heath mid-dense foliage cover — open-heath sparse foliage cover — low shrubland sparse foliage cover — low open shrubland Similarly, shrubland is a category used to describe a type of biome plant group. In this context, shrublands are dense thickets of evergreen sclerophyll shrubs and small trees, called: Chaparral in California Matorral in Chile and Spain Maquis in France and elsewhere around the Mediterranean Macchia in Italy Fynbos in South Africa Kwongan in Southwest Australia Cedar scrub in Texas Hill CountryIn some places shrubland is the mature vegetation type, in other places the result of degradation of former forest or woodland by logging or overgrazing, or disturbance by major fires. A number of World Wildlife Fund biomes are characterized as shrublands, including: Desert scrublands Xeric or desert scrublands occur in the world's deserts and xeric shrublands ecoregions, or in areas of fast-draining sandy soils in more humid regions.
These scrublands are characterized by plants with adaptations to the dry climate, which include small leaves to limit water loss, thorns to protect them from grazing animals, succulent leaves or stems, storage organs to store water, long taproots to reach groundwater. Mediterranean scrublandsMediterranean scrublands occur in the Mediterranean forests and scrub biomes, located in the five Mediterranean climate regions of the world. Scrublands are most common near the seacoast, have adapted to the wind and salt air of the ocean. Low, soft-leaved scrublands around the Mediterranean Basin are known as garrigue in France, phrygana in Greece, tomillares in Spain, batha in Israel. Northern coastal scrub and coastal sage scrub occur along the California coast, strandveld in the Western Cape of South Africa, coastal matorral in central Chile, sand-heath and kwongan in Southwest Australia. Interior scrublandsInterior scrublands occur in semi-arid areas where soils are nutrient-poor, such as on the matas of Portugal which are underlain by Cambrian and Silurian schists.
Florida scrub is another example of interior scrublands. Dwarf shrubs Some vegetation types are formed of dwarf-shrubs: creeping shrubs; these include the maquis and garrigues of Mediterranean climates, the acid-loving dwarf shrubs of heathland and moorland. Fynbos Maquis Prostrate shrub Semi-desert Shrub-steppe Shrub swamp Moorland
An acid is a molecule or ion capable of donating a hydron, or, capable of forming a covalent bond with an electron pair. The first category of acids is the proton donors or Brønsted acids. In the special case of aqueous solutions, proton donors form the hydronium ion H3O+ and are known as Arrhenius acids. Brønsted and Lowry generalized the Arrhenius theory to include non-aqueous solvents. A Brønsted or Arrhenius acid contains a hydrogen atom bonded to a chemical structure, still energetically favorable after loss of H+. Aqueous Arrhenius acids have characteristic properties which provide a practical description of an acid. Acids form aqueous solutions with a sour taste, can turn blue litmus red, react with bases and certain metals to form salts; the word acid is derived from the Latin acidus/acēre meaning sour. An aqueous solution of an acid has a pH less than 7 and is colloquially referred to as'acid', while the strict definition refers only to the solute. A lower pH means a higher acidity, thus a higher concentration of positive hydrogen ions in the solution.
Chemicals or substances having the property of an acid are said to be acidic. Common aqueous acids include hydrochloric acid, acetic acid, sulfuric acid, citric acid; as these examples show, acids can be solutions or pure substances, can be derived from acids that are solids, liquids, or gases. Strong acids and some concentrated weak acids are corrosive, but there are exceptions such as carboranes and boric acid; the second category of acids are Lewis acids. An example is boron trifluoride, whose boron atom has a vacant orbital which can form a covalent bond by sharing a lone pair of electrons on an atom in a base, for example the nitrogen atom in ammonia. Lewis considered this as a generalization of the Brønsted definition, so that an acid is a chemical species that accepts electron pairs either directly or by releasing protons into the solution, which accept electron pairs. However, hydrogen chloride, acetic acid, most other Brønsted-Lowry acids cannot form a covalent bond with an electron pair and are therefore not Lewis acids.
Conversely, many Lewis acids are not Brønsted-Lowry acids. In modern terminology, an acid is implicitly a Brønsted acid and not a Lewis acid, since chemists always refer to a Lewis acid explicitly as a Lewis acid. Modern definitions are concerned with the fundamental chemical reactions common to all acids. Most acids encountered in everyday life are aqueous solutions, or can be dissolved in water, so the Arrhenius and Brønsted-Lowry definitions are the most relevant; the Brønsted-Lowry definition is the most used definition. Hydronium ions are acids according to all three definitions. Although alcohols and amines can be Brønsted-Lowry acids, they can function as Lewis bases due to the lone pairs of electrons on their oxygen and nitrogen atoms; the Swedish chemist Svante Arrhenius attributed the properties of acidity to hydrogen ions or protons in 1884. An Arrhenius acid is a substance that, when added to water, increases the concentration of H+ ions in the water. Note that chemists write H+ and refer to the hydrogen ion when describing acid-base reactions but the free hydrogen nucleus, a proton, does not exist alone in water, it exists as the hydronium ion, H3O+.
Thus, an Arrhenius acid can be described as a substance that increases the concentration of hydronium ions when added to water. Examples include molecular substances such as acetic acid. An Arrhenius base, on the other hand, is a substance which increases the concentration of hydroxide ions when dissolved in water; this decreases the concentration of hydronium because the ions react to form H2O molecules: H3O+ + OH− ⇌ H2O + H2ODue to this equilibrium, any increase in the concentration of hydronium is accompanied by a decrease in the concentration of hydroxide. Thus, an Arrhenius acid could be said to be one that decreases hydroxide concentration, while an Arrhenius base increases it. In an acidic solution, the concentration of hydronium ions is greater than 10−7 moles per liter. Since pH is defined as the negative logarithm of the concentration of hydronium ions, acidic solutions thus have a pH of less than 7. While the Arrhenius concept is useful for describing many reactions, it is quite limited in its scope.
In 1923 chemists Johannes Nicolaus Brønsted and Thomas Martin Lowry independently recognized that acid-base reactions involve the transfer of a proton. A Brønsted-Lowry acid is a species. Brønsted-Lowry acid-base theory has several advantages over Arrhenius theory. Consider the following reactions of acetic acid, the organic acid that gives vinegar its characteristic taste: CH3COOH + H2O ⇌ CH3COO− + H3O+ CH3COOH + NH3 ⇌ CH3COO− + NH+4Both theories describe the first reaction: CH3COOH acts as an Arrhenius acid because it acts as a source of H3O+ when dissolved in water, it acts as a Brønsted acid by donating a proton to water. In the second example CH3COOH undergoes the same transformation, in this case donating a proton to ammonia, but does not relate to the Arrhenius definition of an acid because the reaction does not produce hydronium. CH3COOH is
The emu is the second-largest living bird by height, after its ratite relative, the ostrich. It is endemic to Australia where it is the largest native bird and the only extant member of the genus Dromaius; the emu's range covers most of mainland Australia, but the Tasmanian, Kangaroo Island and King Island subspecies became extinct after the European settlement of Australia in 1788. The bird is sufficiently common for it to be rated as a least-concern species by the International Union for Conservation of Nature. Emus are soft-feathered, flightless birds with long necks and legs, can reach up to 1.9 metres in height. Emus can travel great distances, when necessary can sprint at 50 km/h, they take in copious amounts of water when the opportunity arises. Breeding takes place in May and June, fighting among females for a mate is common. Females can lay several clutches of eggs in one season; the male does the incubation. The eggs hatch after around eight weeks, the young are nurtured by their fathers.
They reach full size after around six months, but can remain as a family unit until the next breeding season. The emu is an important cultural icon of Australia, appearing on the coat of various coins; the bird features prominently in Indigenous Australian mythology. Emus were first reported as having been seen by Europeans when explorers visited the western coast of Australia in 1696; the birds were known on the eastern coast before 1788. The birds were first mentioned under the name of the "New Holland cassowary" in Arthur Phillip's Voyage to Botany Bay, published in 1789 with the following description: This is a species differing in many particulars from that known, is a much larger bird, standing higher on its legs and having the neck longer than in the common one. Total length seven feet two inches; the bill is not different from that of the common Cassowary. The plumage in general consists of a mixture of brown and grey, the feathers are somewhat curled or bent at the ends in the natural state: the wings are so short as to be useless for flight, indeed, are scarcely to be distinguished from the rest of the plumage, were it not for their standing out a little.
The long spines which are seen in the wings of the common sort, are in this not observable,—nor is there any appearance of a tail. The legs are stout, formed much as in the Galeated Cassowary, with the addition of their being jagged or sawed the whole of their length at the back part; the species was named by ornithologist John Latham in 1790 based on a specimen from the Sydney area of Australia, a country, known as New Holland at the time. He collaborated on Phillip's book and provided the first descriptions of, names for, many Australian bird species. In his original 1816 description of the emu, the French ornithologist Louis Jean Pierre Vieillot used two generic names, first Dromiceius and Dromaius, it has been a point of contention since as to which name should be used. Most modern publications, including those of the Australian government, use Dromaius, with Dromiceius mentioned as an alternative spelling; the etymology of the common name "emu" is uncertain, but is thought to have come from an Arabic word for large bird, used by Portuguese explorers to describe the related cassowary in Australia and New Guinea.
Another theory is that it comes from the word "ema", used in Portuguese to denote a large bird akin to an ostrich or crane. In Victoria, some terms for the emu were Barrimal in the Dja Dja Wurrung language, myoure in Gunai, courn in Jardwadjali; the birds were known as murawung or birabayin to the local Eora and Darug inhabitants of the Sydney basin. The emu was long classified, with its closest relatives the cassowaries, in the family Casuariidae, part of the ratite order Struthioniformes. However, an alternate classification was proposed in 2014 by Mitchell et al. based on analysis of mitochondrial DNA. This splits off the Casuariidae into their own order, the Casuariformes, includes only the cassowaries in the family Casuariidae, placing the emus in their own family, Dromaiidae; the cladogram shown below is from their study. Two different Dromaius species were present in Australia at the time of European settlement, one additional species is known from fossil remains; the insular dwarf emus, D. n. baudinianus and D. n. minor present on Kangaroo Island and King Island both became extinct shortly after the arrival of Europeans.
D. n. diemenensis, another insular dwarf emu from Tasmania, became extinct around 1865. However, the mainland subspecies, D. n. novaehollandiae, remains common. The population of these birds varies from decade to de
Chile the Republic of Chile, is a South American country occupying a long, narrow strip of land between the Andes to the east and the Pacific Ocean to the west. It borders Peru to the north, Bolivia to the northeast, Argentina to the east, the Drake Passage in the far south. Chilean territory includes the Pacific islands of Juan Fernández, Salas y Gómez and Easter Island in Oceania. Chile claims about 1,250,000 square kilometres of Antarctica, although all claims are suspended under the Antarctic Treaty; the arid Atacama Desert in northern Chile contains great mineral wealth, principally copper. The small central area dominates in terms of population and agricultural resources, is the cultural and political center from which Chile expanded in the late 19th century when it incorporated its northern and southern regions. Southern Chile is rich in forests and grazing lands, features a string of volcanoes and lakes; the southern coast is a labyrinth of fjords, canals, twisting peninsulas, islands.
Spain conquered and colonized the region in the mid-16th century, replacing Inca rule in the north and centre, but failing to conquer the independent Mapuche who inhabited what is now south-central Chile. After declaring its independence from Spain in 1818, Chile emerged in the 1830s as a stable authoritarian republic. In the 19th century, Chile saw significant economic and territorial growth, ending Mapuche resistance in the 1880s and gaining its current northern territory in the War of the Pacific after defeating Peru and Bolivia. In the 1960s and 1970s, the country experienced severe left-right political polarization and turmoil; this development culminated with the 1973 Chilean coup d'état that overthrew Salvador Allende's democratically elected left-wing government and instituted a 16-year-long right-wing military dictatorship that left more than 3,000 people dead or missing. The regime, headed by Augusto Pinochet, ended in 1990 after it lost a referendum in 1988 and was succeeded by a center-left coalition which ruled through four presidencies until 2010.
The modern sovereign state of Chile is among South America's most economically and stable and prosperous nations, with a high-income economy and high living standards. It leads Latin American nations in rankings of human development, income per capita, state of peace, economic freedom, low perception of corruption, it ranks high regionally in sustainability of the state, democratic development. Chile is a member of the Organisation for Economic Co-operation and Development, joining in 2010, it has the lowest homicide rate in the Americas after Canada. Chile is a founding member of the United Nations, the Union of South American Nations and the Community of Latin American and Caribbean States. There are various theories about the origin of the word Chile. According to 17th-century Spanish chronicler Diego de Rosales, the Incas called the valley of the Aconcagua "Chili" by corruption of the name of a Picunche tribal chief called Tili, who ruled the area at the time of the Incan conquest in the 15th century.
Another theory points to the similarity of the valley of the Aconcagua with that of the Casma Valley in Peru, where there was a town and valley named Chili. Other theories say Chile may derive its name from a Native American word meaning either "ends of the earth" or "sea gulls". Another origin attributed to chilli is the onomatopoeic cheele-cheele—the Mapuche imitation of the warble of a bird locally known as trile; the Spanish conquistadors heard about this name from the Incas, the few survivors of Diego de Almagro's first Spanish expedition south from Peru in 1535–36 called themselves the "men of Chilli". Almagro is credited with the universalization of the name Chile, after naming the Mapocho valley as such; the older spelling "Chili" was in use in English until at least 1900 before switching to "Chile". Stone tool evidence indicates humans sporadically frequented the Monte Verde valley area as long as 18,500 years ago. About 10,000 years ago, migrating indigenous Peoples settled in fertile valleys and coastal areas of what is present-day Chile.
Settlement sites from early human habitation include Monte Verde, Cueva del Milodón and the Pali-Aike Crater's lava tube. The Incas extended their empire into what is now northern Chile, but the Mapuche resisted many attempts by the Inca Empire to subjugate them, despite their lack of state organization, they fought against his army. The result of the bloody three-day confrontation known as the Battle of the Maule was that the Inca conquest of the territories of Chile ended at the Maule river. In 1520, while attempting to circumnavigate the globe, Ferdinand Magellan discovered the southern passage now named after him thus becoming the first European to set foot on what is now Chile; the next Europeans to reach Chile were Diego de Almagro and his band of Spanish conquistadors, who came from Peru in 1535 seeking gold. The Spanish encountered various cultures that supported themselves principally through slash-and-burn agriculture and hunting; the conquest of Chile began in earnest in 1540 and was carried out by Pedro de Valdivia, one of Francisco Pizarro's lieutenants, who founded the city of Santiago on 12 February 1541.
Although the Spanish did not find the extensive gold and silver they sought, they recognize