1.
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
2.
Greece
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Greece, officially the Hellenic Republic, historically also known as Hellas, is a country in southeastern Europe, with a population of approximately 11 million as of 2015. Athens is the capital and largest city, followed by Thessaloniki. Greece is strategically located at the crossroads of Europe, Asia, situated on the southern tip of the Balkan peninsula, it shares land borders with Albania to the northwest, the Republic of Macedonia and Bulgaria to the north, and Turkey to the northeast. Greece consists of nine regions, Macedonia, Central Greece, the Peloponnese, Thessaly, Epirus, the Aegean Islands, Thrace, Crete. The Aegean Sea lies to the east of the mainland, the Ionian Sea to the west, the Cretan Sea and the Mediterranean Sea to the south. Greece has the longest coastline on the Mediterranean Basin and the 11th longest coastline in the world at 13,676 km in length, featuring a vast number of islands, eighty percent of Greece is mountainous, with Mount Olympus being the highest peak at 2,918 metres. From the eighth century BC, the Greeks were organised into various independent city-states, known as polis, which spanned the entire Mediterranean region and the Black Sea. Greece was annexed by Rome in the second century BC, becoming a part of the Roman Empire and its successor. The Greek Orthodox Church also shaped modern Greek identity and transmitted Greek traditions to the wider Orthodox World, falling under Ottoman dominion in the mid-15th century, the modern nation state of Greece emerged in 1830 following a war of independence. Greeces rich historical legacy is reflected by its 18 UNESCO World Heritage Sites, among the most in Europe, Greece is a democratic and developed country with an advanced high-income economy, a high quality of life, and a very high standard of living. A founding member of the United Nations, Greece was the member to join the European Communities and has been part of the Eurozone since 2001. Greeces unique cultural heritage, large industry, prominent shipping sector. It is the largest economy in the Balkans, where it is an important regional investor, the names for the nation of Greece and the Greek people differ from the names used in other languages, locations and cultures. The earliest evidence of the presence of human ancestors in the southern Balkans, dated to 270,000 BC, is to be found in the Petralona cave, all three stages of the stone age are represented in Greece, for example in the Franchthi Cave. Neolithic settlements in Greece, dating from the 7th millennium BC, are the oldest in Europe by several centuries and these civilizations possessed writing, the Minoans writing in an undeciphered script known as Linear A, and the Mycenaeans in Linear B, an early form of Greek. The Mycenaeans gradually absorbed the Minoans, but collapsed violently around 1200 BC and this ushered in a period known as the Greek Dark Ages, from which written records are absent. The end of the Dark Ages is traditionally dated to 776 BC, the Iliad and the Odyssey, the foundational texts of Western literature, are believed to have been composed by Homer in the 7th or 8th centuries BC. With the end of the Dark Ages, there emerged various kingdoms and city-states across the Greek peninsula, in 508 BC, Cleisthenes instituted the worlds first democratic system of government in Athens
3.
Administrative regions of Greece
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The administrative regions of Greece are the countrys thirteen first-level administrative entities, each comprising several second-level units, originally prefectures and, since 2011, regional units. The current regions were established in July 1986, by decision of then-Interior Minister Menios Koutsogiorgas as a second-level administrative entities, as part of a decentralization process inspired by then-Interior Minister Alekos Papadopoulos, they were accorded more powers in the 1997 Kapodistrias reform of local and regional government. They were transformed into separate entities by the 2010 Kallikratis Plan. In the 2011 changes, the general secretary was replaced with a popularly elected regional governor. Many powers of the prefectures, which were abolished or reformed into regional units, were transferred to the region level. The regional organs of the government were in turn replaced by seven decentralized administrations. Bordering the region of Central Macedonia there is one region, Mount Athos. It is located on the easternmost of the three large peninsulas jutting into the Aegean from the Chalcidice Peninsula, ISO 3166-2, GR Administrative divisions of Greece
4.
South Aegean
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The South Aegean is one of the thirteen regions of Greece. It consists of the Cyclades and Dodecanese island groups in the central, the South Aegean region was established in the 1987 administrative reform. With the 2010 Kallikratis plan, its powers and authority were redefined and extended, along with the Northern Aegean region, it is supervised by the Decentralized Administration of the Aegean based at Piraeus. The capital of the region is situated in Ermoupoli on the island of Syros, until the Kallikratis reform, the region consisted of the two prefectures of the Cyclades and the Dodecanese. Andros Ermoúpoli Ialysós Kallithéa Kálymnos Kárpathos Kos Léros Milos Mýkonos Náxos Páros Petaloúdes Ródos Santoríni or Thíra Official website
5.
Thira (regional unit)
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Thira is one of the regional units of Greece. It is part of the region of South Aegean, the regional unit covers the islands of Thira, Anafi, Folegandros, Ios, Sikinos and several smaller islands in the Aegean Sea. As a part of the 2011 Kallikratis government reform, the unit of Thira was created out of the former Cyclades Prefecture. It is subdivided into 5 municipalities and these are, Anafi Folegandros Ios Santorini Sikinos The province of Thira was one of the provinces of the Cyclades Prefecture. It had the territory as the present regional unit
6.
Eastern European Time
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Eastern European Time is one of the names of UTC+02,00 time zone,2 hours ahead of Coordinated Universal Time. The zone uses daylight saving time, so that it uses UTC+03,00 during the summer, a number of African countries use UTC+02,00 all year long, where it is called Central Africa Time, although Egypt and Libya also use the term Eastern European Time. The following countries, parts of countries, and territories use Eastern European Time all year round, Egypt, since 21 April 2015, used EEST from 1988–2010, Kaliningrad Oblast, since 26 October 2014, also used EET in years 1945 and 1991–2011. Libya, since 27 October 2013, switched from Central European Time, used year-round EET from 1980–1981, 1990–1996 and 1998–2012. Belarus, in years 1922–30 and 1990–2011 In Poland this time was used in years 1918–22, in time of World War II, Germany implemented MET in east occupied territories. Republic of Crimea and Sevastopol used EET as part of Ukraine in years 1991-94 and 1996-2014 Turkey, used EET in years 1910-1978, now uses year round DST timezone called Further-eastern European Time or Turkey Time. The Turkish Republic of Northern Cyprus also uses FET, sometimes, due to its use on Microsoft Windows, FLE Standard Time or GTB Standard Time are used to refer to Eastern European Time. Since political, in addition to geographical, criteria are used in the drawing of time zones. The EET time zone, were it drawn by purely geographical terms, the easternmost part of the Republic of Macedonia, including the city of Strumica. The absolutely easternmost part of Serbia, in the Pirot District, the easternmost town in Norway, Vardø, lies at 30°51 E, which is located east of even of the central meridian of UTC+2, i. e. east of Istanbul and Alexandria. The Norwegian-Russian border is the place where CET borders Moscow time. There is a point at the Norway-Finland-Russia tripoint, near the town of Rayakoski. Belarus is located between 23°11′E and 32°47′E and is fully located with the physical UTC+2 area, but it uses UTC+3 year around. This also includes the city of Anapa, at the westernmost tip of the Krasnodar Krai near the entrance to the Sea of Azov, the Norway–Russia–Finland tri-zone point at Muotkavaara is surrounded by three different times in winter, two in summer. It had three time zones year-around before 2014, two of the four tripoints of Belarus and the tripoint of the Kaliningrad Region are surrounded by three different times in winter
7.
Daylight saving time
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Daylight saving time is the practice of advancing clocks during summer months by one hour so that evening daylight lasts an hour longer, while sacrificing normal sunrise times. Typically, regions that use Daylight Savings Time adjust clocks forward one hour close to the start of spring, American inventor and politician Benjamin Franklin proposed a form of daylight time in 1784. New Zealander George Hudson proposed the idea of saving in 1895. The German Empire and Austria-Hungary organized the first nationwide implementation, starting on April 30,1916, many countries have used it at various times since then, particularly since the energy crisis of the 1970s. The practice has both advocates and critics, DST clock shifts sometimes complicate timekeeping and can disrupt travel, billing, record keeping, medical devices, heavy equipment, and sleep patterns. Computer software often adjusts clocks automatically, but policy changes by various jurisdictions of DST dates, industrialized societies generally follow a clock-based schedule for daily activities that do not change throughout the course of the year. The time of day that individuals begin and end work or school, North and south of the tropics daylight lasts longer in summer and shorter in winter, with the effect becoming greater as one moves away from the tropics. However, they will have one hour of daylight at the start of each day. Supporters have also argued that DST decreases energy consumption by reducing the need for lighting and heating, DST is also of little use for locations near the equator, because these regions see only a small variation in daylight in the course of the year. After ancient times, equal-length civil hours eventually supplanted unequal, so civil time no longer varies by season, unequal hours are still used in a few traditional settings, such as some monasteries of Mount Athos and all Jewish ceremonies. This 1784 satire proposed taxing window shutters, rationing candles, and waking the public by ringing church bells, despite common misconception, Franklin did not actually propose DST, 18th-century Europe did not even keep precise schedules. However, this changed as rail transport and communication networks came to require a standardization of time unknown in Franklins day. Modern DST was first proposed by the New Zealand entomologist George Hudson, whose shift work job gave him time to collect insects. An avid golfer, he also disliked cutting short his round at dusk and his solution was to advance the clock during the summer months, a proposal he published two years later. The proposal was taken up by the Liberal Member of Parliament Robert Pearce, a select committee was set up to examine the issue, but Pearces bill did not become law, and several other bills failed in the following years. Willett lobbied for the proposal in the UK until his death in 1915, william Sword Frost, mayor of Orillia, Ontario, introduced daylight saving time in the municipality during his tenure from 1911 to 1912. Starting on April 30,1916, the German Empire and its World War I ally Austria-Hungary were the first to use DST as a way to conserve coal during wartime, Britain, most of its allies, and many European neutrals soon followed suit. Russia and a few other countries waited until the year
8.
Eastern European Summer Time
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Eastern European Summer Time is one of the names of UTC+3 time zone,3 hours ahead of Coordinated Universal Time. It is used as a daylight saving time in some European and Middle Eastern countries. During the winter periods, Eastern European Time is used, since 1996 European Summer Time has been observed from the last Sunday in March to the last Sunday in October, previously the rules were not uniform across the European Union. Syria, since 1983 Ukraine, Moscow Summer Time in years 1981–89, regular EEST from 1992 In one year 1991 EEST was used also in Moscow, egypt has previously used EEST from 1957–2010 and 2014–2015. Turkey, has previously used EEST from 1970-1978 EEST, Moscow Summer Time from 1979–1983, and EEST from 1985-2016
9.
Vehicle registration plates of Greece
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Greek vehicle registration plates are composed of three letters and four digits per plate. The letters represent the district that issues the plates while the numbers begin from 1000 to 9999, similar plates with digits beginning from 1 to 999 are issued for motorcycles which exceed 50 cc. With the exception of Athens and Thessaloniki, all districts are represented by the first 2 letters, the final letter in the sequence changes in Greek alphabetical order after 9,000 issued plates. For example, Patras plates are ΑΧΑ-1000, where ΑΧ represents the Achaia prefecture of which Patras is the capital, when ΑΧΑ-9999 is reached the plates turn to ΑΧΒ-1000 and this continues until ΑΧΧ is finished. Only the letters from the intersection between the Latin and Greek alphabets by glyph appearance are used, namely Α, Β, Ε, Ζ, Η, Ι, Κ, Μ, Ν, Ο, Ρ, Τ, Υ, Χ. This is because Greece is a party to the Vienna Convention on Road Traffic. The rule applies in a way in Russia, Ukraine, Belarus, Bosnia and Herzegovina. Combinations used for residents are L-NNNN and are limited. Until 2003, taxis used L-NNNN, the plate was aligned with the prefecture, when number plates were introduced to Greece, they were numbered and in the late 1950s the system was L-NNN and LL-NNN. The letters were Greek letters and Latin letters, respectively, in 1956, the system was NNNNNN. In 1972, they became lettered and the system was LL-NNNN while trucks used L-NNNN, in 1983, the system was LLL-NNNN and the first two letters are prefecture letters. In 2004, the euroband was added, the first 2 of 3 letters of a licence plate usually represent the prefecture where the car was registered. Π. — Disabled in war ΔΟΚ — Test plates ΔΣ — Corps Diplomatique or foreign delegation Ε. Α. or ΕΛ. ΑΣ. — Hellenic Police ΛΣ — Coast Guard ΞΑ — Foreign missions ΕΣ — Hellenic Army ΠΑ — Hellenic Air Force ΠΝ — Hellenic Navy ΠΣ — Fire Guard ΠΚ — President of the Government, i. e
10.
Greek language
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Greek is an independent branch of the Indo-European family of languages, native to Greece and other parts of the Eastern Mediterranean. It has the longest documented history of any living language, spanning 34 centuries of written records and its writing system has been the Greek alphabet for the major part of its history, other systems, such as Linear B and the Cypriot syllabary, were used previously. The alphabet arose from the Phoenician script and was in turn the basis of the Latin, Cyrillic, Armenian, Coptic, Gothic and many other writing systems. Together with the Latin texts and traditions of the Roman world, during antiquity, Greek was a widely spoken lingua franca in the Mediterranean world and many places beyond. It would eventually become the official parlance of the Byzantine Empire, the language is spoken by at least 13.2 million people today in Greece, Cyprus, Italy, Albania, Turkey, and the Greek diaspora. Greek roots are used to coin new words for other languages, Greek. Greek has been spoken in the Balkan peninsula since around the 3rd millennium BC, the earliest written evidence is a Linear B clay tablet found in Messenia that dates to between 1450 and 1350 BC, making Greek the worlds oldest recorded living language. Among the Indo-European languages, its date of earliest written attestation is matched only by the now extinct Anatolian languages, the Greek language is conventionally divided into the following periods, Proto-Greek, the unrecorded but assumed last ancestor of all known varieties of Greek. The unity of Proto-Greek would have ended as Hellenic migrants entered the Greek peninsula sometime in the Neolithic era or the Bronze Age, Mycenaean Greek, the language of the Mycenaean civilisation. It is recorded in the Linear B script on tablets dating from the 15th century BC onwards, Ancient Greek, in its various dialects, the language of the Archaic and Classical periods of the ancient Greek civilisation. It was widely known throughout the Roman Empire, after the Roman conquest of Greece, an unofficial bilingualism of Greek and Latin was established in the city of Rome and Koine Greek became a first or second language in the Roman Empire. The origin of Christianity can also be traced through Koine Greek, Medieval Greek, also known as Byzantine Greek, the continuation of Koine Greek in Byzantine Greece, up to the demise of the Byzantine Empire in the 15th century. Much of the written Greek that was used as the language of the Byzantine Empire was an eclectic middle-ground variety based on the tradition of written Koine. Modern Greek, Stemming from Medieval Greek, Modern Greek usages can be traced in the Byzantine period and it is the language used by the modern Greeks, and, apart from Standard Modern Greek, there are several dialects of it. In the modern era, the Greek language entered a state of diglossia, the historical unity and continuing identity between the various stages of the Greek language is often emphasised. Greek speakers today still tend to regard literary works of ancient Greek as part of their own rather than a foreign language and it is also often stated that the historical changes have been relatively slight compared with some other languages. According to one estimation, Homeric Greek is probably closer to demotic than 12-century Middle English is to modern spoken English, Greek is spoken by about 13 million people, mainly in Greece, Albania and Cyprus, but also worldwide by the large Greek diaspora. Greek is the language of Greece, where it is spoken by almost the entire population
11.
English language
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English /ˈɪŋɡlɪʃ/ is a West Germanic language that was first spoken in early medieval England and is now the global lingua franca. Named after the Angles, one of the Germanic tribes that migrated to England, English is either the official language or one of the official languages in almost 60 sovereign states. It is the third most common language in the world, after Mandarin. It is the most widely learned second language and a language of the United Nations, of the European Union. It is the most widely spoken Germanic language, accounting for at least 70% of speakers of this Indo-European branch, English has developed over the course of more than 1,400 years. The earliest forms of English, a set of Anglo-Frisian dialects brought to Great Britain by Anglo-Saxon settlers in the century, are called Old English. Middle English began in the late 11th century with the Norman conquest of England, Early Modern English began in the late 15th century with the introduction of the printing press to London and the King James Bible, and the start of the Great Vowel Shift. Through the worldwide influence of the British Empire, modern English spread around the world from the 17th to mid-20th centuries, English is an Indo-European language, and belongs to the West Germanic group of the Germanic languages. Most closely related to English are the Frisian languages, and English, Old Saxon and its descendent Low German languages are also closely related, and sometimes Low German, English, and Frisian are grouped together as the Ingvaeonic or North Sea Germanic languages. Modern English descends from Middle English, which in turn descends from Old English, particular dialects of Old and Middle English also developed into a number of other English languages, including Scots and the extinct Fingallian and Forth and Bargy dialects of Ireland. English is classified as a Germanic language because it shares new language features with other Germanic languages such as Dutch, German and these shared innovations show that the languages have descended from a single common ancestor, which linguists call Proto-Germanic. Through Grimms law, the word for foot begins with /f/ in Germanic languages, English is classified as an Anglo-Frisian language because Frisian and English share other features, such as the palatalisation of consonants that were velar consonants in Proto-Germanic. The earliest form of English is called Old English or Anglo-Saxon, in the fifth century, the Anglo-Saxons settled Britain and the Romans withdrew from Britain. England and English are named after the Angles, Old English was divided into four dialects, the Anglian dialects, Mercian and Northumbrian, and the Saxon dialects, Kentish and West Saxon. Through the educational reforms of King Alfred in the century and the influence of the kingdom of Wessex. The epic poem Beowulf is written in West Saxon, and the earliest English poem, Modern English developed mainly from Mercian, but the Scots language developed from Northumbrian. A few short inscriptions from the period of Old English were written using a runic script. By the sixth century, a Latin alphabet was adopted, written with half-uncial letterforms and it included the runic letters wynn ⟨ƿ⟩ and thorn ⟨þ⟩, and the modified Latin letters eth ⟨ð⟩, and ash ⟨æ⟩
12.
Aegean Sea
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The Aegean Sea is an elongated embayment of the Mediterranean Sea located between the Greek and Anatolian peninsulas, i. e. between the mainlands of Greece and Turkey. In the north, it is connected to the Marmara Sea and Black Sea by the Dardanelles, the Aegean Islands are within the sea and some bound it on its southern periphery, including Crete and Rhodes. The sea was known as Archipelago, but in English this words meaning has changed to refer to the Aegean Islands and, generally. In ancient times, there were various explanations for the name Aegean, a possible etymology is a derivation from the Greek word αἶγες – aiges = waves, hence wavy sea, cf. also αἰγιαλός, hence meaning sea-shore. The Venetians, who ruled many Greek islands in the High and Late Middle Ages, popularized the name Archipelago, in some South Slavic languages the Aegean is often called White Sea. The Aegean Sea covers about 214,000 square kilometres in area, the seas maximum depth is 3,543 metres, east of Crete. The Aegean Islands are found within its waters, with the following islands delimiting the sea on the south, Kythera, Antikythera, Crete, Kasos, Karpathos, many of the Aegean Islands, or chains of islands, are actually extensions of the mountains on the mainland. One chain extends across the sea to Chios, another extends across Euboea to Samos, the International Hydrographic Organization defines the limits of the Aegean Sea as follows, On the South. In the Dardanelles. A line joining Kum Kale and Cape Helles, the dense Mediterranean water sinks below the Black Sea inflow to a depth of 23–30 metres, then flows through the Dardanelles Strait and into the Sea of Marmara at velocities of 5–15 cm/s. The Black Sea outflow moves westward along the northern Aegean Sea, Aegean Sea Intermediate Water – Aegean Sea Intermediate Water extends from 40–50 m to 200–300 metres with temperatures ranging from 11–18 °C. Aegean Sea Bottom Water – occurring at depths below 500–1000 m with a uniform temperature. The current coastline dates back to about 4000 BC, before that time, at the peak of the last ice age sea levels everywhere were 130 metres lower, and there were large well-watered coastal plains instead of much of the northern Aegean. When they were first occupied, the islands including Milos with its important obsidian production were probably still connected to the mainland. The present coastal arrangement appeared c.7000 BC, with post-ice age sea levels continuing to rise for another 3,000 years after that, the subsequent Bronze Age civilizations of Greece and the Aegean Sea have given rise to the general term Aegean civilization. In ancient times, the sea was the birthplace of two ancient civilizations – the Minoans of Crete and the Mycenean Civilization of the Peloponnese, later arose the city-states of Athens and Sparta among many others that constituted the Athenian Empire and Hellenic Civilization. Plato described the Greeks living round the Aegean like frogs around a pond, the Aegean Sea was later invaded by the Persians and the Romans, and inhabited by the Byzantine Empire, the Bulgarians, the Venetians, the Genoese, the Seljuq Turks, and the Ottoman Empire. The Aegean was the site of the democracies, and its seaways were the means of contact among several diverse civilizations of the Eastern Mediterranean. Many of the islands in the Aegean have safe harbours and bays, in ancient times, navigation through the sea was easier than travelling across the rough terrain of the Greek mainland
13.
Archipelago
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An archipelago, sometimes called an island group or island chain, is a chain, cluster or collection of islands. The word archipelago is derived from the Greek ἄρχι- – arkhi-, in Italian, possibly following a tradition of antiquity, the Archipelago was the proper name for the Aegean Sea and, later, usage shifted to refer to the Aegean Islands. It is now used to refer to any group or, sometimes. Archipelagos may be isolated in large amounts of water or neighbouring a large land mass. For example, Scotland has more than 700 islands surrounding its mainland which form an archipelago, archipelagos are often volcanic, forming along island arcs generated by subduction zones or hotspots, but may also be the result of erosion, deposition, and land elevation. Depending on their origin, islands forming archipelagos can be referred to as oceanic islands, continental fragments. Oceanic islands are mainly of volcanic origin, continental fragments correspond to land masses that have separated from a continental mass due to tectonic displacement. Indonesia, Japan, Taiwan, the Philippines, New Zealand, Maldives, the Bahamas, Greece, Hawaii, the largest archipelagic state in the world by area and population is Indonesia. Island arc List of landforms List of archipelagos by number of islands List of archipelagos List of islands Chisholm, Hugh, ed. Archipelago
14.
Volcano
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A volcano is a rupture in the crust of a planetary-mass object, such as Earth, that allows hot lava, volcanic ash, and gases to escape from a magma chamber below the surface. Earths volcanoes occur because its crust is broken into 17 major, therefore, on Earth, volcanoes are generally found where tectonic plates are diverging or converging. This type of volcanism falls under the umbrella of plate hypothesis volcanism, Volcanism away from plate boundaries has also been explained as mantle plumes. These so-called hotspots, for example Hawaii, are postulated to arise from upwelling diapirs with magma from the boundary,3,000 km deep in the Earth. Volcanoes are usually not created where two plates slide past one another. Erupting volcanoes can pose hazards, not only in the immediate vicinity of the eruption. Historically, so-called volcanic winters have caused catastrophic famines, the word volcano is derived from the name of Vulcano, a volcanic island in the Aeolian Islands of Italy whose name in turn comes from Vulcan, the god of fire in Roman mythology. The study of volcanoes is called volcanology, sometimes spelled vulcanology, at the mid-oceanic ridges, two tectonic plates diverge from one another as new oceanic crust is formed by the cooling and solidifying of hot molten rock. Most divergent plate boundaries are at the bottom of the oceans, therefore, most volcanic activity is submarine, black smokers are evidence of this kind of volcanic activity. Where the mid-oceanic ridge is above sea-level, volcanic islands are formed, for example, subduction zones are places where two plates, usually an oceanic plate and a continental plate, collide. In this case, the plate subducts, or submerges under the continental plate forming a deep ocean trench just offshore. In a process called flux melting, water released from the subducting plate lowers the temperature of the overlying mantle wedge. This magma tends to be very viscous due to its high content, so it often does not reach the surface. When it does reach the surface, a volcano is formed, typical examples of this kind of volcano are Mount Etna and the volcanoes in the Pacific Ring of Fire. Because tectonic plates move across them, each volcano becomes dormant and is eventually re-formed as the plate advances over the postulated plume and this theory is currently under criticism, however. The most common perception of a volcano is of a mountain, spewing lava and poisonous gases from a crater at its summit, however. The features of volcanoes are more complicated and their structure. Some volcanoes have rugged peaks formed by lava domes rather than a summit crater while others have features such as massive plateaus
15.
Caldera
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A caldera is a large cauldron-like depression that forms following the evacuation of a magma chamber/reservoir. When large volumes of magma are erupted over a time period. The ground surface then collapses downward into the emptied magma chamber. Although sometimes described as a crater, the feature is actually a type of sinkhole, as it is formed through subsidence, only seven known caldera-forming collapses have occurred since the start of the 20th century, most recently at Bárðarbunga volcano in Iceland. The word comes from Spanish caldera, and this from Latin caldaria, in some texts the English term cauldron is also used. If enough magma is ejected, the chamber is unable to support the weight of the volcanic edifice above it. A roughly circular fracture, the fault, develops around the edge of the chamber. Ring fractures serve as feeders for fault intrusions which are known as ring dykes. Secondary volcanic vents may form above the ring fracture, as the magma chamber empties, the center of the volcano within the ring fracture begins to collapse. The collapse may occur as the result of a cataclysmic eruption. The total area that collapses may be hundreds or thousands of square kilometers, some calderas are known to host rich ore deposits. One of the worlds best-preserved mineralized calderas is the Sturgeon Lake Caldera in northwestern Ontario, Canada, if the magma is rich in silica, the caldera is often filled in with ignimbrite, tuff, rhyolite, and other igneous rocks. Silica-rich magma has a high viscosity, and therefore does not flow easily like basalt, as a result, gases tend to become trapped at high pressure within the magma. Further lava flows may be erupted, if volcanic activity continues, the center of the caldera may be uplifted in the form of a resurgent dome such as is seen at Cerro Galán, Lake Toba, Yellowstone, etc. by subsequent intrusion of magma. A silicic or rhyolitic caldera may erupt hundreds or even thousands of kilometers of material in a single event. Even small caldera-forming eruptions, such as Krakatoa in 1883 or Mount Pinatubo in 1991, may result in significant local destruction, large calderas may have even greater effects. When Yellowstone Caldera last erupted some 650,000 years ago, it released about 1,000 km3 of material, by comparison, when Mount St. Helens erupted in 1980, it released ~1.2 km3 of ejecta. The ecological effects of the eruption of a large caldera can be seen in the record of the Lake Toba eruption in Indonesia, more recently several geneticists, including Lynn Jorde and Henry Harpending have proposed that the human species was reduced to approximately five to ten thousand people
16.
Cyclades
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The Cyclades are an island group in the Aegean Sea, southeast of mainland Greece and a former administrative prefecture of Greece. They are one of the groups which constitute the Aegean archipelago. The name refers to the islands around the island of Delos. The Cyclades is where the native Greek breed of cat originated, the largest island of the Cyclades is Naxos. Interest lagged, then picked up in the century, as collectors competed for the modern-looking figures that seemed so similar to sculpture by Jean Arp or Constantin Brâncuși. Sites were looted and a trade in forgeries arose. The context for many of these Cycladic figurines has been mostly destroyed, another intriguing and mysterious object is that of the Cycladic frying pans. More accurate archaeology has revealed the outlines of a farming and seafaring culture that had immigrated from Anatolia c.5000 BCE. Early Cycladic culture evolved in three phases, between c.3300 –2000 BCE, when it was swamped in the rising influence of Minoan Crete. The culture of mainland Greece contemporary with Cycladic culture is known as the Helladic period, in recent decades the Cyclades have become popular with European and other tourists, and as a result there have been problems with erosion, pollution, and water shortages. There are also many islands including Donousa, Eschati, Gyaros, Irakleia, Koufonisia, Makronisos. The name Cyclades refers to the forming a circle around the sacred island of Delos. Most of the islands are uninhabited. Ermoupoli on Syros is the town and administrative center of the former prefecture. The islands are peaks of a mountainous terrain, with the exception of two volcanic islands, Milos and Santorini. The climate is dry and mild, but with the exception of Naxos the soil is not very fertile, agricultural produce includes wine, fruit, wheat, olive oil. Cooler temperatures are in higher elevations and mainly do not receive wintry weather, the Cyclades are bounded to the south by the Sea of Crete. The Cyclades Prefecture was one of the prefectures of Greece and these have been reorganised at the 2011 Kallikratis reform as well
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Therasia
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Therasia, also known as Thirasía, is an island in the volcanic island group of Santorini in the Greek Cyclades. It lies north-west of Nea Kameni, an island formed in recent centuries by volcanic activity. Therasia is the second largest island of the group, the largest by far being Thera, Therasia has a land area of 9.299 square kilometres and its population was 319 inhabitants at the 2011 census. It is part of the unit of Oia. Thera and Therasia were separated by the Thera eruption, at Knossos, in a LMIIIA context, seven Linear B texts while calling upon all the gods make sure to grant primacy to an elsewhere-unattested entity called qe-ra-si-ja and, once, qe-ra-si-jo. However this probably refers to a god or a rather than to an island *Qherasia > Therasia. Agía Eiríni Agrilia Manolas Ormos Korfou Potamos Official website Official Facebook Page
18.
Nea Kameni
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Nea Kameni is a small uninhabited Greek island of volcanic origin located in the Aegean Sea within the flooded Santorini caldera. Nea Kameni and the small island Palea Kameni have formed over the past two millennia by repeated eruptions of dacite lava and ash. The Roman historian Cassius Dio records in the year 47 AD This year a small islet, hitherto unknown, major eruptions over the past 300 years took place in 1707–1712, 1866–1870, 1925–1928, and 1939-1941. The last small eruption happened in 1950 and involved lava dome extrusion, nea Kameni is nearly round and has a diameter of approximately 2 kilometers and an area of 3.4 km2. Nea Kameni is monitored closely by scientists from the Institute for the Study, the island has many active sulfur vents, as well as a carpet of red grassy succulents on the thin soil in the summertime. The nearly barren island is visited daily by dozens of tourist boats throughout the summer, visitors climb a gravel path to reach the top of the 130-meter-high volcanic crater, where it is possible to complete a full circuit of the rim. Nea Kameni Virtual Tour, Volcano 360 Panorama Virtual Tour in High Resolution
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Olivine
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The mineral olivine is a magnesium iron silicate with the formula 2SiO4. Thus it is a type of nesosilicate or orthosilicate and it is a common mineral in the Earths subsurface but weathers quickly on the surface. The ratio of magnesium and iron varies between the two endmembers of the solid solution series, forsterite and fayalite, compositions of olivine are commonly expressed as molar percentages of forsterite and fayalite. Forsterite has a high melting temperature at atmospheric pressure, almost 1,900 °C. The melting temperature varies smoothly between the two endmembers, as do other properties, olivine incorporates only minor amounts of elements other than oxygen, silicon, magnesium and iron. Manganese and nickel commonly are the elements present in highest concentrations. Olivine gives its name to the group of minerals with a structure which includes tephroite, monticellite and kirschsteinite. It has a structure similar to magnetite but uses one quadravalent. Olivine gemstones are called peridot and chrysolite, olivine is named for its typically olive-green color, though it may alter to a reddish color from the oxidation of iron. Translucent olivine is sometimes used as a gemstone called peridot, some of the finest gem-quality olivine has been obtained from a body of mantle rocks on Zabargad island in the Red Sea. Olivine occurs in mafic and ultramafic igneous rocks and as a primary mineral in certain metamorphic rocks. Mg-rich olivine crystallizes from magma that is rich in magnesium and low in silica and that magma crystallizes to mafic rocks such as gabbro and basalt. Ultramafic rocks such as peridotite and dunite can be left after extraction of magmas. Olivine and high pressure structural variants constitute over 50% of the Earths upper mantle, the metamorphism of impure dolomite or other sedimentary rocks with high magnesium and low silica content also produces Mg-rich olivine, or forsterite. In contrast, Mg-rich olivine does not occur stably with silica minerals, Mg-rich olivine is stable to pressures equivalent to a depth of about 410 km within Earth. Mg-rich olivine has also discovered in meteorites, on the Moon and Mars, falling into infant stars. Such meteorites include chondrites, collections of debris from the early Solar System, the spectral signature of olivine has been seen in the dust disks around young stars. The tails of comets often have the signature of olivine
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Hornblende
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Hornblende is a complex inosilicate series of minerals. It is not a mineral in its own right, but the name is used as a general or field term. Hornblende is a mixture of three molecules, a calcium-iron-magnesium silicate, an aluminium-iron-magnesium silicate, and an iron-magnesium silicate. The general formula can be given as 2–358O222, some metals vary in their occurrence and magnitude, Manganese and titanium are often present. Sodium and potassium are present and fluorine often substitutes for the hydroxyl in the crystalline structure. Hornblende has a hardness of 5–6, a gravity of 2. 9–3.4 and is typically an opaque green. Its cleavage angles are at 56 and 124 degrees and it is most often confused with various pyroxene minerals and biotite mica, which are black and can be found in granite and in charnockite. Hornblende is a constituent of many igneous and metamorphic rocks such as granite, syenite, diorite, gabbro, basalt, andesite, gneiss. It is the mineral of amphibolites. Very dark brown to black hornblendes that contain titanium are ordinarily called basaltic hornblende, from the fact that they are usually a constituent of basalt, hornblende alters easily to chlorite and epidote. A rare variety of hornblende contains less than 5% of iron oxide, is gray to white in color, and named edenite, from its locality in Edenville, Orange County, New York. List of minerals Hurlbut, Cornelius S. Klein, Cornelis,1985, Manual of Mineralogy, 20th ed. John Wiley and Sons, New York, p 416-7, ISBN 0-471-80580-7 Scandinavian mineral gallery retrieved 06/21/05
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Akrotiri (Santorini)
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Akrotiri is a Minoan Bronze Age settlement on the volcanic Greek island of Santorini. The settlement was destroyed in the Theran eruption about 1627 BC and buried in volcanic ash, the settlement has been suggested as a possible inspiration for Platos story of Atlantis. The site has been excavated since 1967, the earliest evidence for human habitation of Akrotiri can be traced back as early as the fifth millennium BC, when it was a small fishing and farming village. By the end of the millennium, this community developed and expanded significantly. One factor for Akrotiri’s growth may be the relations it established with other cultures in the Aegean. This all came to an end, however, in the late 17th century BC with the eruption of Thera. The excavation is named for a village situated on a hill nearby. The name of the site in antiquity is unknown, Akrotiri was buried by the massive Theran eruption in the middle of the second millennium BC, as a result, like the Roman ruins of Pompeii after it, it is remarkably well-preserved. Frescoes, pottery, furniture, advanced drainage systems and three-story buildings have been discovered at the site, the earliest excavations on Santorini were conducted by French geologist F. Fouque in 1867, after some local people found old artifacts at a quarry. Later, in 1895-1900, the digs by German archeologist Baron Friedrich Hiller von Gaertringen revealed the ruins of ancient Thera on Mesa Vouno. Also, a later, R. Zahn excavated in the locality of Potamos, near Akrotiri. Extensive modern excavation was started in 1967 by Spyridon Marinatos, Spyridon Marinatos choice of site proved to be correct, and just a few hours into the excavation, the remains of the buried city began to be discovered. The next step was to determine the extent of the city and he experimented with tunneling into the pumice, but this technique was later abandoned. Excavated artifacts have been installed in a museum distant from the site, with many objects, only a single gold object has been found, hidden beneath flooring, and no uninterred human skeletal remains have been found. This indicates that an evacuation was performed with little or no loss of life. An ambitious modern roof structure, meant to protect the site, collapsed just prior to its completion in 2005, no damage was caused to the antiquities. As a result, the site was closed to visitors until April 2012, all of the pigments used by the artists at Akrotiri for painting the frescoes look as though they are all mineral based, and thus have resulted in the great preservation of the pieces. The colors used in Theran painting includes white, yellow, red, brown, blue, as a result, often on the same fresco, the paint has penetrated the plaster in some areas but flakes off easily in others
22.
Volcanic eruption
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Several types of volcanic eruptions—during which lava, tephra, and assorted gases are expelled from a volcanic vent or fissure—have been distinguished by volcanologists. These are often named after famous volcanoes where that type of behavior has been observed, some volcanoes may exhibit only one characteristic type of eruption during a period of activity, while others may display an entire sequence of types all in one eruptive series. There are three different types of eruptions, the most well-observed are magmatic eruptions, which involve the decompression of gas within magma that propels it forward. Phreatomagmatic eruptions are another type of eruption, driven by the compression of gas within magma. Within these wide-defining eruptive types are several subtypes, the weakest are Hawaiian and submarine, then Strombolian, followed by Vulcanian and Surtseyan. The stronger eruptive types are Pelean eruptions, followed by Plinian eruptions, subglacial and phreatic eruptions are defined by their eruptive mechanism, and vary in strength. An important measure of strength is Volcanic Explosivity Index, an order of magnitude scale ranging from 0 to 8 that often correlates to eruptive types. Explosive eruptions are characterized by gas-driven explosions that propels magma and tephra, effusive eruptions, meanwhile, are characterized by the outpouring of lava without significant explosive eruption. Volcanic eruptions vary widely in strength, on the one extreme there are effusive Hawaiian eruptions, which are characterized by lava fountains and fluid lava flows, which are typically not very dangerous. On the other extreme, Plinian eruptions are large, violent, volcanoes are not bound to one eruptive style, and frequently display many different types, both passive and explosive, even the span of a single eruptive cycle. Volcanoes do not always erupt vertically from a crater near their peak. Some volcanoes exhibit lateral and fissure eruptions, notably, many Hawaiian eruptions start from rift zones, and some of the strongest Surtseyan eruptions develop along fracture zones. Scientists believed that pulses of magma mixed together in the chamber before climbing upward—a process estimated to several thousands of years. But Columbia University volcanologists found that the eruption of Costa Rica’s Irazú Volcano in 1963 was likely triggered by magma that took a route from the mantle over just a few months. The volcanic explosivity index is a scale, from 0 to 8 and it is used by the Smithsonian Institutions Global Volcanism Program in assessing the impact of historic and prehistoric lava flows. It operates in a way similar to the Richter scale for earthquakes, the vast majority of volcanic eruptions are of VEIs between 0 and 2. Volcanic eruptions by VEI index Magmatic eruptions produce juvenile clasts during explosive decompression from gas release, Hawaiian eruptions are a type of volcanic eruption, named after the Hawaiian volcanoes with which this eruptive type is hallmark. Hawaiian eruptions are the calmest types of events, characterized by the effusive eruption of very fluid basalt-type lavas with low gaseous content
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Minoan eruption
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It devastated the island of Thera, including the Minoan settlement at Akrotiri and communities and agricultural areas on nearby islands and the coast of Crete with a related earthquake or tsunami. There are no clear ancient records of the eruption, which may have inspired certain Greek myths, caused turmoil in Egypt, geological evidence shows the Thera volcano erupted numerous times over several hundred thousand years before the Minoan eruption. In a repeating process, the volcano would erupt, then eventually collapse into a roughly circular seawater-filled caldera. The caldera would slowly refill with magma, building a new volcano, immediately prior to the Minoan eruption, the walls of the caldera formed a nearly continuous ring of islands with the only entrance lying between Thera and the tiny island of Aspronisi. This cataclysmic eruption was centered on an island just north of the existing island of Nea Kameni in the centre of the then-existing caldera. The northern part of the caldera was refilled by the ash and lava. With an estimated DRE in excess of 60 km3, the volume of ejecta was approximately 100 km3, if so, the eruptions Volcanic Explosivity Index was 7. The volcano ejected up to four times as much as the eruption by Krakatoa in 1883. The Thera volcanic events and subsequent ashfall probably sterilized the island, on Santorini, there is a 60 m thick layer of white tephra that overlies the soil clearly delineating the ground level prior to the eruption. This layer has three bands that indicate the different phases of the eruption. Studies have identified four major phases, and one minor precursory tephra fall. Since no human remains have been found at the Akrotiri site and it is also suggested that several months before the eruption, Santorini experienced one or more earthquakes, which damaged the local settlements. Intense magmatic activity of the first major phase of the eruption deposited up to 7 m of pumice and ash, with a minor lithic component, archaeological evidence indicated burial of man-made structures with limited damage. The second and third eruption phases involved pyroclastic flow and lava fountain activity, man-made structures not buried during Minoan A were completely destroyed. The third phase was characterized by the initiation of caldera collapse. The fourth, and last, major phase was marked by varied activity, lithic-rich base surge deposits, lahars, debris flows and this phase was characterized by the completion of caldera collapse, which produced megatsunamis. Although the fracturing process is not yet known, the statistical analysis indicates that the caldera had formed just before the eruption. The area of the island was smaller, and the southern and eastern coastlines appeared regressed, during the eruption, the landscape was covered by the pumice sediments
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Minoan civilization
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The Minoan civilization was an Aegean Bronze Age civilization on the island of Crete and other Aegean islands which flourished from about 2600 to 1100 BC. It preceded the Mycenaean civilization of Ancient Greece, the civilization was rediscovered at the beginning of the 20th century through the work of British archaeologist Arthur Evans. It has been described as the earliest of its kind in Europe, the term Minoan, which refers to the mythical King Minos, originally described the pottery of the period. Minos was associated in Greek mythology with the labyrinth and the Minotaur, according to Homer, Crete once had 90 cities. The Minoan period saw trade between Crete and Aegean and Mediterranean settlements, particularly the Near East, traders and artists, the Minoan cultural influence reached beyond Crete to the Cyclades, Egypts Old Kingdom, copper-bearing Cyprus, Canaan and the Levantine coast, and Anatolia. Some of its best art is preserved in the city of Akrotiri on the island of Santorini, although the Minoan language and writing systems remain undecipherable and are subjects of academic dispute, they apparently conveyed a language entirely different from the later Greek. The reason for the end of the Minoan period is unclear, theories include Mycenaean invasions from mainland Greece, the term Minoan refers to the mythical King Minos of Knossos. Its origin is debated, but it is attributed to archeologist Arthur Evans. Minos was associated in Greek mythology with the labyrinth, which Evans identified with the site at Knossos. However, Karl Hoeck had already used the title Das Minoische Kreta in 1825 for volume two of his Kreta, this appears to be the first known use of the word Minoan to mean ancient Cretan, Evans said that applied it, not invented it. Hoeck, with no idea that the archaeological Crete had existed, had in mind the Crete of mythology, although Evans 1931 claim that the term was unminted before he used it was called a brazen suggestion by Karadimas and Momigliano, he coined its archaeological meaning. Instead of dating the Minoan period, archaeologists use two systems of relative chronology, the first, created by Evans and modified by later archaeologists, is based on pottery styles and imported Egyptian artifacts. Evans system divides the Minoan period into three eras, early, middle and late. These eras are subdivided—for example, Early Minoan I, II and III, another dating system, proposed by Greek archaeologist Nicolas Platon, is based on the development of architectural complexes known as palaces at Knossos, Phaistos, Malia and Kato Zakros. Platon divides the Minoan period into pre-, proto-, neo-, the relationship between the systems in the table includes approximate calendar dates from Warren and Hankey. The Thera eruption occurred during a phase of the LM IA period. Efforts to establish the volcanic eruptions date have been controversial, the eruption is identified as a natural event catastrophic for the culture, leading to its rapid collapse. Although stone-tool evidence exists that hominins may have reached Crete as early as 130,000 years ago, evidence for the first anatomically-modern human presence dates to 10, the oldest evidence of modern human habitation on Crete are pre-ceramic Neolithic farming-community remains which date to about 7000 BC
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Volcanic ash
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Volcanic ash consists of fragments of pulverized rock, minerals and volcanic glass, created during volcanic eruptions and measuring less than 2 mm in diameter. The term volcanic ash is often loosely used to refer to all explosive eruption products. Volcanic ash is formed during volcanic eruptions when dissolved gases in magma expand. The force of the escaping gas shatters the magma and propels it into the atmosphere where it solidifies into fragments of volcanic rock and glass. Ash is also produced when magma comes into contact with water during phreatomagmatic eruptions, once in the air, ash is transported by wind up to thousands of kilometers away. Volcanic ash is formed during volcanic eruptions, phreatomagmatic eruptions. Explosive eruptions occur when magma decompresses as it rises, allowing dissolved volatiles to exsolve into gas bubbles, as more bubbles nucleate a foam is produced, which decreases the density of the magma, accelerating it up the conduit. Fragmentation occurs when bubbles occupy ~70-80 vol% of the erupting mixture, when fragmentation occurs, violently expanding bubbles tear the magma apart into fragments which are ejected into the atmosphere where they solidify into ash particles. Fragmentation is an efficient process of ash formation and is capable of generating very fine ash even without the addition of water. Volcanic ash is produced during phreatomagmatic eruptions. During these eruptions fragmentation occurs when magma comes into contact with bodies of water groundwater, as the magma, which is significantly hotter than the boiling point of water, comes into contact with water an insulating vapor film forms. Eventually this vapor film will collapse leading to direct coupling of the cold water and this increases the heat transfer which leads to the rapid expansion of water and fragmentation of the magma into small particles which are subsequently ejected from the volcanic vent. Fragmentation causes an increase in area between magma and water creating a feedback mechanism, leading to further fragmentation and production of fine ash particles. Pyroclastic density currents can also produce ash particles and these are typically produced by lava dome collapse or collapse of the eruption column. Within pyroclastic density currents particle abrasion occurs as particles interact with each resulting in a reduction in grain size. In addition, ash can be produced during secondary fragmentation of pumice fragments and these processes produce large quantities of very fine grained ash which is removed from pyroclastic density currents in co-ignimbrite ash plumes. Physical and chemical characteristics of volcanic ash are primarily controlled by the style of volcanic eruption, another parameter controlling the amount of ash produced is the duration of the eruption, the longer the eruption is sustained, the more ash will be produced. The types of minerals present in volcanic ash are dependent on the chemistry of the magma from which it erupted, low energy eruptions of basalt produce a characteristically dark coloured ash containing ~45 - 55% silica that is generally rich in iron and magnesium
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Crete
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Crete is the largest and most populous of the Greek islands, 88th-largest island in the world and the fifth-largest island in the Mediterranean Sea, after Sicily, Sardinia, Cyprus, and Corsica. Crete and a number of surrounding islands and islets constitute the region of Crete, the capital and the largest city is Heraklion. As of 2011, the region had a population of 623,065, Crete forms a significant part of the economy and cultural heritage of Greece, while retaining its own local cultural traits. It was once the centre of the Minoan civilization, which is regarded as the earliest recorded civilization in Europe. The island is first referred to as Kaptara in texts from the Syrian city of Mari dating from the 18th century BC, repeated later in Neo-Assyrian records and it was also known in ancient Egyptian as Keftiu, strongly suggesting a similar Minoan name for the island. The current name of Crete is thought to be first attested in Mycenaean Greek texts written in Linear B, through the words
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Tsunami
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A tsunami or tidal wave, also known as a seismic sea wave, is a series of waves in a water body caused by the displacement of a large volume of water, generally in an ocean or a large lake. Unlike normal ocean waves which are generated by wind, or tides which are generated by the pull of the Moon and Sun. Tsunami waves do not resemble normal undersea currents or sea waves, Tsunamis generally consist of a series of waves with periods ranging from minutes to hours, arriving in a so-called internal wave train. Wave heights of tens of metres can be generated by large events, numerous terms are used in the English language to describe waves created in a body of water by the displacement of water, however, none of the terms in frequent use are entirely accurate. The term tsunami, meaning harbour wave in literal translation, comes from the Japanese 津波, while not entirely accurate, as tsunami are not restricted to harbours, tsunami is currently the term most widely accepted by geologists and oceanographers. Tsunami are sometimes referred to as tidal waves and this once-popular term derives from the most common appearance of tsunami, which is that of an extraordinarily high tidal bore. Although the meanings of tidal include resembling or having the form or character of the tides, use of the tidal wave is discouraged by geologists. The term seismic sea wave also is used to refer to the phenomenon, prior to the rise of the use of the term tsunami in English-speaking countries, scientists generally encouraged the use of the term seismic sea wave rather than tidal wave. The Sumatran region is not unused to tsunamis either, with earthquakes of varying magnitudes regularly occurring off the coast of the island, Tsunamis are an often underestimated hazard in the Mediterranean Sea and parts of Europe. The tsunami claimed more than 123,000 lives in Sicily, the Storegga Slide in the Norwegian sea and some examples of tsunamis affecting the British Isles refer to landslide and meteotsunamis predominantly and less to earthquake-induced waves. The cause, in my opinion, of this phenomenon must be sought in the earthquake, at the point where its shock has been the most violent the sea is driven back, and suddenly recoiling with redoubled force, causes the inundation. Without an earthquake I do not see how such an accident could happen, the principal generation mechanism of a tsunami is the displacement of a substantial volume of water or perturbation of the sea. This displacement of water is attributed to either earthquakes, landslides, volcanic eruptions, glacier calvings or more rarely by meteorites. The waves formed in this way are then sustained by gravity, tides do not play any part in the generation of tsunamis. Tsunami can be generated when the sea floor abruptly deforms and vertically displaces the overlying water and they grow in height when they reach shallower water, in a wave shoaling process described below. A tsunami can occur in any state and even at low tide can still inundate coastal areas. On April 1,1946, the 8.6 Mw Aleutian Islands earthquake occurred with a maximum Mercalli intensity of VI and it generated a tsunami which inundated Hilo on the island of Hawaii with a 14-metre high surge. Between 165 and 173 were killed, the area where the earthquake occurred is where the Pacific Ocean floor is subducting under Alaska
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Atlantis
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In the story, Athens repels the Atlantean attack unlike any other nation of the known world, supposedly giving testament to the superiority of Platos concept of a state. At the end of the story, Atlantis eventually falls out of favor with the gods, despite its minor importance in Platos work, the Atlantis story has had a considerable impact on literature. The allegorical aspect of Atlantis was taken up in works of several Renaissance writers, such as Francis Bacons New Atlantis. On the other hand, 19th-century amateur scholars misinterpreted Platos account as historical tradition, most notably in Ignatius L. Donnellys Atlantis, The Antediluvian World. As a consequence, Atlantis has become a byword for any and all supposed advanced prehistoric lost civilizations and continues to inspire contemporary fiction, while present-day philologists and historians accept the storys fictional character, there is still debate on what served as its inspiration. Platos dialogues Timaeus and Critias, written in 360 BC, contain the earliest references to Atlantis, for unknown reasons, Plato never completed Critias. Now in this island of Atlantis there existed a confederation of kings, of great and marvelous power, which held sway over all the island, and over many other islands also and parts of the continent. The four people appearing in those two dialogues are the politicians Critias and Hermocrates as well as the philosophers Socrates and Timaeus of Locri, in his works Plato makes extensive use of the Socratic method in order to discuss contrary positions within the context of a supposition. The Timaeus begins with an introduction, followed by an account of the creations and structure of the universe and ancient civilizations. In the introduction, Socrates muses about the society, described in Platos Republic. Critias mentions a historical tale that would make the perfect example. In his account, ancient Athens seems to represent the perfect society and Atlantis its opponent, representing the very antithesis of the perfect traits described in the Republic. According to Critias, the Hellenic gods of old divided the land so that each god might have their own lot, Poseidon was appropriately, and to his liking, bequeathed the island of Atlantis. The island was larger than Ancient Libya and Asia Minor combined, fifty stadia from the coast was a mountain that was low on all sides. Broke it off all round about, the central island itself was five stades in diameter. In Platos myth, Poseidon fell in love with Cleito, the daughter of Evenor and Leucippe, who bore him five pairs of male twins. The eldest of these, Atlas, was made king of the entire island and the ocean, and was given the mountain of his birth. Atlass twin Gadeirus, or Eumelus in Greek, was given the extremity of the island towards the pillars of Hercules
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Latin Empire
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It was established after the capture of Constantinople in 1204 and lasted until 1261. Baldwin IX, Count of Flanders, was crowned the first Latin emperor as Baldwin I on 16 May 1204, the last Latin emperor, Baldwin II, went into exile, but the imperial title survived, with several pretenders to it, until the 14th century. The original name of state in the Latin language was Imperium Romaniae. This name was used based on the fact that the name for the Eastern Roman Empire in this period had been Romania. The names Byzantine and Latin were not contemporaneous terms, the term Latin has been used because the crusaders were Roman Catholic and used Latin as their liturgical and scholarly language. It is used in contrast to the Eastern Orthodox locals who used Greek in both liturgy and common speech, after the fall of Constantinople in the Fourth Crusade, the crusaders agreed to divide up Byzantine territory. In the Partitio terrarum imperii Romaniae, signed on 1 October 1204, none of these polities actually controlled the city of Rome, which remained under the temporal authority of the Pope. The initial campaigns of the crusaders in Asia Minor resulted in the capture of most of Bithynia by 1205, with the defeat of the forces of Theodore I Laskaris at Poemanenum and Prusa. Latin successes continued, and in 1207 a truce was signed with Theodore, the Latins inflicted a further defeat on Nicaean forces at the Rhyndakos river in October 1211, and three years later the Treaty of Nymphaeum recognized their control of most of Bithynia and Mysia. The peace was maintained until 1222, when the resurgent power of Nicaea felt sufficiently strong to challenge the Latin Empire, Nicaea turned also to the Aegean, capturing the islands awarded to the empire. In 1235, finally, the last Latin possessions fell to Nicaea, unlike in Asia, where the Latin Empire faced only an initially weak Nicaea, in Europe it was immediately confronted with a powerful enemy, the Bulgarian tsar Kaloyan. When Baldwin campaigned against the Byzantine lords of Thrace, they called upon Kaloyan for help, at the Battle of Adrianople on 14 April 1205, the Latin heavy cavalry and knights were crushed by Kaloyans troops and Cuman allies, and Emperor Baldwin was captured. He was imprisoned in the Bulgarian capital Tarnovo until his later in 1205. At the same time, another Greek successor state, the Despotate of Epirus, under Michael I Komnenos Doukas, posed a threat to the vassals in Thessalonica. Henry demanded his submission, which Michael provided, giving off his daughter to Henrys brother Eustace in the summer of 1209 and this alliance allowed Henry to launch a campaign in Macedonia, Thessaly and Central Greece against the rebellious Lombard lords of Thessalonica. However, Michaels attack on the Kingdom of Thessalonica in 1210 forced him to north to relieve the city. In 1214 however, Michael died, and was succeeded by Theodore Komnenos Doukas, on 11 June 1216, while supervising repairs to the walls of Thessalonica, Henry died, and was succeeded by Peter of Courtenay, who himself was captured and executed by Theodore the following year. A regency was set up in Constantinople, headed by Peters widow, Yolanda of Flanders, epirote armies then conquered Thrace in 1225–26, appearing before Constantinople itself
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Agape, Chionia, and Irene
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Saints Agape, Chionia, and Irene were three virgin sisters who, according to Christian tradition, were martyred for their faith in the year 304 AD. The story of their martyrdom is the subject of Dulcitius, a 10th-century medieval Latin drama by the secular canoness, Hrotsvitha of Gandersheim and their feast day is April 3. Agape, Chione and Irene were brought before Dulcitius, governor of Macedonia and he asked Agape and Chionia where they had developed this objection to such food, and Chionia responded that she had learned it from her Lord Jesus Christ. She and Agape again refused to eat the food, and were burned alive. Meanwhile, Dulcitius found that Irene had been continuing to keep Christian books and he examined her again, and she declared that when the decrees against Christians had been published, she and several others fled to the mountains. She would not name the others who had fled with her, upon returning home from the mountains, they hid the books they had kept. Dulcitius then ordered Irene to be stripped and exposed in a brothel and this was done, and no one mistreated Irene at the brothel. The governor then gave Irene a second chance to abide by the laws, Dulcitius then sentenced her to death. The books that had found with her were burned as well. Three other individuals were tried with the sisters, of these, one woman was remanded as she was pregnant. The fates of the two are unknown. Attwater, Donald & John, Catherine Rachel, full online text of Hrosvithas play, Dulcitus, Fordham University
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Cathedral
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A cathedral is a Christian church which contains the seat of a bishop, thus serving as the central church of a diocese, conference, or episcopate. The counterpart term for such a church in German is Dom from Latin domus ecclesiae or domus episcopalis, also Italian Duomo, Dutch Domkerk, when the church at which an archbishop or metropolitan presides is specifically intended, the term kathedrikos naos is used. In addition, both the Catholic Church and Orthodox churches have formed new dioceses within formerly Protestant lands for converts, consequently, it is not uncommon to find Christians in a single city being served by three or more cathedrals of differing denominations. In the Catholic tradition, the term cathedral correctly applies only to a church houses the seat of the bishop of a diocese. The abbey church of a territorial abbacy serves the same function, the Catholic Church also uses the following terms. A pro-cathedral is a parish or other church used temporarily as a cathedral, usually while the cathedral of a diocese is under construction, renovation and this designation applies only as long as the temporary use continues. A co-cathedral is a cathedral in a diocese that has two sees. A proto-cathedral is the cathedral of a transferred see. The cathedral church of a bishop is called the metropolitan cathedral. The term cathedral actually carries no implication as to the size or ornateness of the building, nevertheless, most cathedrals are particularly impressive edifices. The building is now under renovation and restoration for solemn dedication under the title Christ Cathedral in 2018, in the ancient world the chair, on a raised dais, was the distinctive mark of a teacher or rhetor and thus symbolises the bishops role as teacher. A raised throne within a hall was also definitive for a Late Antique presiding magistrate. The history of cathedrals starts in the year 313, when the emperor Constantine the Great personally adopted Christianity, in the third century, the phrase ascending the platform, ad pulpitum venire, becomes the standard term for Christian ordination. During the siege of Dura Europos in 256, a complete Christian house church, or domus ecclesiae was entombed in a bank, surviving when excavated. Otherwise the large room had no decoration or distinctive features at all, in 269, soon after Dura fell to the Persian army, a body of clerics assembled a charge sheet against the bishop of Antioch, Paul of Samosata, in the form of an open letter. Characteristically a Roman magistrate presided from a throne in a large, richly decorated and aisled rectangular hall called a basilica. The earliest of these new basilican cathedrals of which remains are still visible is below the Cathedral of Aquileia on the northern tip of the Adriatic sea. The three halls create a courtyard, in which was originally located a separate baptistery
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Perissa, Santorini
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Perissa is a village on the island of Santorini, Greece. It is located 13 km to the southeast of Fira, near the Messa Vouno rock, according to the 2011 census, Perissa has 678 permanent inhabitants. It is part of the community of Emporio, Perissa boasts magnificent beaches on the Aegean including Perissa Beach itself. There are the remnants of the ancient Early Christian church of Saint Irene, its form is the present name of the island
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Oia, Greece
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Oia or Ia is a small town and former community in the South Aegean on the islands of Thira and Therasia, in the Cyclades, Greece. Since the 2011 local government reform it has been part of the municipality of Santorini and it covers the whole island of Therasia and the northwesternmost part of Santorini, which it shares with the municipal unit of Santorini. The main street is named Nikolaou Nomikou, the population was 1,545 inhabitants at the 2011 census, and the land area is 19.449 km2. Oia was previously known as Apano Meria, a name which occurs locally as Pano Meria. The Ancient Greek Oia was one of the two harbours of ancient Thera and was located in the southeast of the island, where Kamari is now, Oia reached the peak of prosperity in the late 19th and early 20th centuries. Its economic prosperity was based on its merchant fleet, which plied trade in the Eastern Mediterranean, the two-story captains houses built on the highest part of the village are a reminder of the villages former affluence. Part of the town was destroyed by the 1956 earthquake, under the da Corogna family, Agios Nikolaos Kastell, also called Apanomeria, was one of five local citadels. Its residential keep, Goulas, is now in the oldest part of the town, in 1537, Hayreddin Barbarossa conquered the Aegean islands and placed them under Sultan Selim II. However, Santorini remained under the Crispo family until 1566, passing then to Joseph Nasi, from the 16th to the 19th century, the settlement was designated Apanomeria on maps. In the mid-17th century, Jean de Thévenot uses the name Castelli San Nicolas, the name was changed to Oia in the second half of the 19th century. In 1890 Oia had approximately 2,500 residents and approximately 130 sailing ships, there was a wharf in the bay of Armeni. Excellent wine was produced in quantity in the hinterland and exported to France amongst other places, the economy of the town declined in the early 20th century on account of wars, economic depression and over extraction of fish resources. The 7.8 magnitude earthquake on 9 July 1956 caused considerable damage, the epicentre of the strongest aftershock was located off the northern coast of Santorini. The earthquake was followed by renewed emigration, and in 1977 Oia had only 306 inhabitants, after the earthquake, the village redeveloped into an attractive tourist town of the Cyclades, and is known as a picture perfect town which gets crowded with people during the summer season. Oia is a village on the north west edge of the Santorini island within the Cyclades. It extends for almost 2 kilometres along the edge of the caldera that forms the island of Santorini. Immediately to the east is Phinikia, and about 500 metres to the north is Tholos, the small fishing village of Ormos Armeni lies below Oia to the south and is reached via steps. There is a connection to Therasia from the harbour village of Ormos Ammoudi to the west
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Imerovigli
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Imerovigli is a village on the island of Santorini, Greece, adjacent to the north of the island capital Fira. Imerovigli is mostly famous for its sunset, that it is called balcony to the Aegean. Its houses are built amphitheatrically around the caldera and it is crossed by narrow, Imerovigli has many lovely churches, all made in the Cycladic architectural style. They most notable are the church of Ai-Stratis, in the centre of the village, another famous site of Imerovigli is Skaros, which are the remains of a Venetian Castle built in 1207 by Marco Sanudo, the ruler of all Cyclades islands that time. Imerovigli has only 470 permanent inhabitants
35.
Santorini caldera
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Santorini caldera is a large, mostly submerged caldera, located in the southern Aegean Sea,120 kilometers north of Crete in Greece. Visible above water is the circular Santorini island group, consisting of Santorini, the island, Therasia and Aspronisi at the periphery. The caldera measures about 12 by 7 km, with 300 m high cliffs on three sides. There are two volcanic islands at the center of the caldera, Nea Kameni and Palea Kameni. The main island, Santorini has an area of 75.8 km2 km2, Therasia 9.3 km2, the volcanic complex of Santorini is the most active part of the South Aegean Volcanic Arc, which includes the volcanoes of Methana, Milos, Santorini and Nisyros. It marks the subduction of the African tectonic plate underneath the Aegean subplate of the Eurasian tectonic plate and it is characterized by earthquakes at depths of 150–170 km. Non-volcanic rocks are exposed on Santorini at the Profitis Ilias Mountain, Mesa Vouno, the Gavrillos ridge, Pirgos, Monolithos, the Kameni islands at the center of the caldera are made of lava rocks. The subsequent Skaros caldera was created about 70,000 years BP, the current caldera was formed about 3600 years BP during the Minoan eruption. Palea Kameni and Nea Kameni were formed as a result of multiple, although dormant, Santorini is an active volcano. Numerous minor and medium-sized, mainly effusive eruptions have built the dark-colored lava shields of Nea and Palea Kameni inside the caldera and their last eruption was in 1950, and now only fumarolic activity, primarily inside the recently active craters, takes place. GPS instruments have registered renewed deformation around the caldera in 2011 and 2012, the huge Minoan eruption of Santorini in the 17th century BC may have inspired the legend of Atlantis. It was rated 7, the highest score for a historical eruption, in the Smithsonian Global Volcanism Programs Volcanic Explosivity Index
36.
Assyrtiko
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Assyrtiko or Asyrtiko is a white Greek wine grape indigenous to the island of Santorini. Assyrtiko is widely planted in the arid volcanic-ash-rich soil of Santorini and other Aegean islands and it is also found on other scattered regions of Greece such as Chalkidiki. On Santorini, many old vine plantations of Assyrtiko exists, of many are non-grafted. These plantations have shown resistance to Phylloxera, the mineral profile of the grape bodes well for blending and in recent times it has been blended often with Sauvignon blanc, Sémillon and Malagousia. Assyrtiko grapes clusters are large, with transparent yellow-gold skin and juicy flesh, in the volcanic soil of Santorini, there appear to be some unique characteristics that develop in the grape variety, and therefore in the wine. One of these characteristics is that Assyrtiko does not lose its acidity even if it is very ripe, throughout Greece, the grape is vinified to make a variety of dry and sweet wines, including Vinsanto-like musky and syrup-sweet dessert wines. In Retsina, it is blended with the less-acidic Savatiano grape. Assyrtiko is also known under the synonyms Arcytico, Assirtico, Assyrtico, Asurtico, and Asyrtiko
37.
Metamorphism
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Metamorphism is the change of minerals or geologic texture in pre-existing rocks, without the protolith melting into liquid magma. The change occurs primarily due to heat, pressure, and the introduction of chemically active fluids, the chemical components and crystal structures of the minerals making up the rock may change even though the rock remains a solid. Changes at or just beneath Earths surface due to weathering and/or diagenesis are not classified as metamorphism, Metamorphism typically occurs between diagenesis, and melting. Three types of metamorphism exist, contact, dynamic, and regional, Metamorphism produced with increasing pressure and temperature conditions is known as prograde metamorphism. Conversely, decreasing temperatures and pressure characterize retrograde metamorphism, Metamorphic rocks can change without melting. When pressure is applied, somewhat flattened grains that orient in the same direction have a stable configuration. The upper boundary of metamorphic conditions is related to the onset of melting processes in the rock, the maximum temperature for metamorphism is typically 700 –900 °C, depending on the pressure and on the composition of the rock. Migmatites are rocks formed at this limit, which contain pods. Since the 1980s it has recognized that rocks are rarely dry enough. Conditions producing widespread regionally metamorphosed rocks occur during an orogenic event, the collision of two continental plates or island arcs with continental plates produce the extreme compressional forces required for the metamorphic changes typical of regional metamorphism. These orogenic mountains are eroded, exposing the intensely deformed rocks typical of their cores. The conditions within the slab as it plunges toward the mantle in a subduction zone also produce regional metamorphic effects. The techniques of structural geology are used to unravel the collisional history, regional metamorphism can be described and classified into metamorphic facies or metamorphic zones of temperature/pressure conditions throughout the orogenic terrane. Contact metamorphism occurs typically around intrusive igneous rocks as a result of the increase caused by the intrusion of magma into cooler country rock. The area surrounding the intrusion where the contact metamorphism effects are present is called the metamorphic aureole, contact metamorphic rocks are usually known as hornfels. Rocks formed by contact metamorphism may not present signs of deformation and are often fine-grained. Contact metamorphism is greater adjacent to the intrusion and dissipates with distance from the contact, the size of the aureole depends on the heat of the intrusion, its size, and the temperature difference with the wall rocks. Dikes generally have small aureoles with minimal metamorphism whereas large ultramafic intrusions can have significantly thick, the metamorphic grade of an aureole is measured by the peak metamorphic mineral which forms in the aureole
38.
Miocene
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The Miocene is the first geological epoch of the Neogene Period and extends from about 23.03 to 5.333 million years ago. The Miocene was named by Sir Charles Lyell and its name comes from the Greek words μείων and καινός and means less recent because it has 18% fewer modern sea invertebrates than the Pliocene. The Miocene follows the Oligocene Epoch and is followed by the Pliocene Epoch, the earth went from the Oligocene through the Miocene and into the Pliocene, with the climate slowly cooling towards a series of ice ages. The Miocene boundaries are not marked by a single distinct global event, the apes arose and diversified during the Miocene, becoming widespread in the Old World. By the end of this epoch, the ancestors of humans had split away from the ancestors of the chimpanzees to follow their own evolutionary path, as in the Oligocene before it, grasslands continued to expand and forests to dwindle in extent. In the Miocene seas, kelp forests made their first appearance, the plants and animals of the Miocene were fairly modern. The Miocene faunal stages from youngest to oldest are typically named according to the International Commission on Stratigraphy, Two subdivisions each form the lower, middle, continents continued to drift toward their present positions. Mountain building took place in western North America, Europe, both continental and marine Miocene deposits are common worldwide with marine outcrops common near modern shorelines. Well studied continental exposures occur in the North American Great Plains, India continued to collide with Asia, creating dramatic new mountain ranges. The Tethys Seaway continued to shrink and then disappeared as Africa collided with Eurasia in the Turkish–Arabian region between 19 and 12 Ma. The subsequent uplift of mountains in the western Mediterranean region and a fall in sea levels combined to cause a temporary drying up of the Mediterranean Sea near the end of the Miocene. The global trend was towards increasing aridity caused primarily by global cooling reducing the ability of the atmosphere to absorb moisture, climates remained moderately warm, although the slow global cooling that eventually led to the Pleistocene glaciations continued. Although a long-term cooling trend was well underway, there is evidence of a period during the Miocene when the global climate rivalled that of the Oligocene. The Miocene warming began 21 million years ago and continued until 14 million years ago, by 8 million years ago, temperatures dropped sharply once again, and the Antarctic ice sheet was already approaching its present-day size and thickness. Greenland may have begun to have large glaciers as early as 7 to 8 million years ago, life during the Miocene Epoch was mostly supported by the two newly formed biomes, kelp forests and grasslands. This allows for more grazers, such as horses, rhinoceroses, ninety five percent of modern plants existed by the end of this epoch. The higher organic content and water retention of the deeper and richer grassland soils, with long term burial of carbon in sediments, produced a carbon and this, combined with higher surface albedo and lower evapotranspiration of grassland, contributed to a cooler, drier climate. The expansion of grasslands and radiations among terrestrial herbivores correlates to fluctuations in CO2
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