1.
Pergamon Altar
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The structure is 35.64 metres wide and 33.4 metres deep, the front stairway alone is almost 20 metres wide. The base is decorated with a frieze in relief showing the battle between the Giants and the Olympian gods known as the Gigantomachy. There is a second, smaller and less well-preserved high relief frieze on the inner court walls which surround the fire altar on the upper level of the structure at the top of the stairs. In a set of scenes, it depicts events from the life of Telephus, legendary founder of the city of Pergamon and son of the hero Heracles and Auge. In 1878, the German engineer Carl Humann began official excavations on the acropolis of Pergamon, the excavation was undertaken in order to rescue the altar friezes and expose the foundation of the edifice. Later, other ancient structures on the acropolis were brought to light, upon negotiating with the Turkish government, it was agreed that all frieze fragments found at the time would become the property of the Berlin museums. In Berlin, Italian restorers reassembled the panels comprising the frieze from the thousands of fragments that had been recovered, in order to display the result and create a context for it, a new museum was erected in 1901 on Berlins Museum Island. Because this first Pergamon Museum proved to be inadequate and structurally unsound, it was demolished in 1909 and replaced with a much larger museum. This new museum is open to the public on the island. The exhibit is scheduled to reopen in late 2019 or early 2020, the Pergamene kingdom founded by Philetaerus at the beginning of the 3rd century BC was initially part of the Hellenistic Seleucid empire. Attalus I, successor and nephew of Eumenes I, was the first to achieve independence for the territory. This victory over the Galatians, a threat to the Pergamene kingdom, secured his power, with conquests in Asia Minor at the expense of the weakened Seleucids he could briefly increase the size of his kingdom. A Seleucid counteroffensive under Antiochos III reached the gates of Pergamon, since the Seleucids were becoming stronger in the east, Attalus turned his attention westward to Greece and was able to occupy almost all of Euboea. His son, Eumenes II, further limited the influence of the Galatians and ruled alongside his brother Attalus II, in 188 BC, Eumenes II was able to create the Treaty of Apamea as an ally of Rome, thus reducing the influence of the Seleucids in Asia Minor. The Attalids were thus an emerging power with the desire to demonstrate their importance to the world through the construction of imposing buildings. As is the case with most young dynasties, the Attalids sought to anchor their legitimacy with endowments, the imposing altar accordingly had also a political dimension. In the meantime, later datings relating the altar to archaeological findings, investigation of the altars construction and friezes has led to the conclusion that it was not conceived as a monument to a particular victory. The design of Pergamene victory monuments is known from the literature, the scanty remnants of the dedicatory inscription also seem to indicate that the altar was consecrated to the gods because of favors they had bestowed
2.
Greek mythology
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It was a part of the religion in ancient Greece. Greek mythology is explicitly embodied in a collection of narratives. Greek myth attempts to explain the origins of the world, and details the lives and adventures of a variety of gods, goddesses, heroes, heroines. These accounts initially were disseminated in a tradition, today the Greek myths are known primarily from ancient Greek literature. The oldest known Greek literary sources, Homers epic poems Iliad and Odyssey, focus on the Trojan War, archaeological findings provide a principal source of detail about Greek mythology, with gods and heroes featured prominently in the decoration of many artifacts. Geometric designs on pottery of the eighth century BC depict scenes from the Trojan cycle as well as the adventures of Heracles, in the succeeding Archaic, Classical, and Hellenistic periods, Homeric and various other mythological scenes appear, supplementing the existing literary evidence. Greek mythology has had an influence on the culture, arts. Poets and artists from ancient times to the present have derived inspiration from Greek mythology and have discovered contemporary significance and relevance in the themes, Greek mythology is known today primarily from Greek literature and representations on visual media dating from the Geometric period from c. Mythical narration plays an important role in every genre of Greek literature. Nevertheless, the only general mythographical handbook to survive from Greek antiquity was the Library of Pseudo-Apollodorus and this work attempts to reconcile the contradictory tales of the poets and provides a grand summary of traditional Greek mythology and heroic legends. Apollodorus of Athens lived from c, 180–125 BC and wrote on many of these topics. His writings may have formed the basis for the collection, however the Library discusses events that occurred long after his death, among the earliest literary sources are Homers two epic poems, the Iliad and the Odyssey. Other poets completed the cycle, but these later and lesser poems now are lost almost entirely. Despite their traditional name, the Homeric Hymns have no connection with Homer. They are choral hymns from the part of the so-called Lyric age. Hesiods Works and Days, a poem about farming life, also includes the myths of Prometheus, Pandora. The poet gives advice on the best way to succeed in a dangerous world, lyrical poets often took their subjects from myth, but their treatment became gradually less narrative and more allusive. Greek lyric poets, including Pindar, Bacchylides and Simonides, and bucolic poets such as Theocritus and Bion, additionally, myth was central to classical Athenian drama
3.
Twelve Olympians
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Hades and Persephone were sometimes included as part of the twelve Olympians, although in general Hades was excluded, because he resided permanently in the underworld and never visited Olympus. The Twelve Olympians, also known as the Dodekatheon, were the deities of the Greek pantheon. The Olympians gained their supremacy in a war of gods in which Zeus led his siblings to victory over their predecessor gods. The concept of the Twelve Gods is older than any extant Greek or Roman source, the gods meet in council in the Homeric epics, but the first ancient reference to religious ceremonies for the Olympians collectively is found in the Homeric Hymn to Hermes. The Greek cult of the Twelve Olympians can be traced to 6th-century BC Athens, the Altar of the Twelve Gods at Athens is usually dated to the archonship of the younger Pesistratos, in 522/521 BC. In ancient Greek religion, the Olympian Gods and the Cults of Twelve Gods were often relatively distinct concepts, while the number was fixed at twelve, there was considerable variation as to which deities were included. However, the twelve as most commonly portrayed in art and poetry were Zeus, Hera, Poseidon, Demeter, Athena, Apollo, Artemis, Ares, Aphrodite, Hephaestus, Hermes and either Hestia, or Dionysus. Hades, known in the Eleusinian tradition as Pluto, was not usually included among the Olympians because his realm was the underworld. Plato connected the Twelve Olympians with the months, and implies that he considered Pluto one of the twelve in proposing that the final month be devoted to him. In Phaedrus, Plato seems to exclude Hestia from the rank of the great gods. At Olympia there were six altars dedicated to six pairs of gods, Zeus and Poseidon, Hera and Athena, Hermes and Apollo, the Charites and Dionysus, Artemis and Alpheus, the historian Herodotus states that Heracles was included as one of the Twelve by some. At Kos, Heracles and Dionysus are added to the Twelve, for Pindar, the Bibliotheca, and Herodorus of Heraclea, Heracles is not one of the Twelve Gods, but the one who established their cult. Lucian includes Heracles and Asclepius as members of the Twelve, without explaining which two had to give way for them, hebe, Helios, Selene, Eos, Eros and Persephone are other important gods and goddesses who are sometimes included in a group of twelve. Eros is often depicted alongside the twelve, especially his mother Aphrodite. Notes ^ Romans also associated Phoebus with Helios and the sun itself, however, ^ According to an alternate version of her birth, Aphrodite was born of Uranus, Zeus grandfather, after Cronus threw his castrated genitals into the sea. This supports the etymology of her name, foam-born, as such, Aphrodite would belong to the same generation as Cronus, Zeus father, and would be Zeus aunt. See the birth of Aphrodite The following gods and goddess are sometimes included as one of the twelve Olympians, the following gods and goddesses were not usually counted as Olympians, although they had close ties to them. Aeolus – King of the winds, keeper of the Anemoi, Alpheus – God of the River Alpheus
4.
Asclepius
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Asclepius was a hero and god of medicine in ancient Greek religion and mythology. Asclepius represents the aspect of the medical arts, his daughters are Hygieia, Iaso, Aceso, Aglæa/Ægle. He was associated with the Roman/Etruscan god Vediovis and the Egyptian Imhotep and he was one of Apollos sons, sharing with Apollo the epithet Paean. The rod of Asclepius, a staff, remains a symbol of medicine today. Those physicians and attendants who served this god were known as the Therapeutae of Asclepius, the etymology of the name is unknown. In his revised version of Frisks Griechisches etymologisches Wörterbuch, R. S. P. Beekes gives this summary of the different attempts, but the variants of Asklepios and those of the word for mole do not agree. The name is typical for Pre-Greek words, apart from minor variations we find α/αι followed by -γλαπ- or -σκλαπ-/-σχλαπ/β-, I think that the -σ- renders an original affricate, which was lost before the -γ-. Szemerényis etymology from Hitt. assula- well-being and piya- give cannot be correct, Beekes suggested a Pre-Greek proto-form *Atyklap-. He was the son of Apollo and, according to the earliest accounts and his mother was killed for being unfaithful to Apollo and was laid out on a funeral pyre to be consumed, but the unborn child was rescued from her womb. Or, alternatively, his mother died in labor and was out on the pyre to be consumed. Apollo carried the baby to the centaur Chiron who raised Asclepius and it is said that in return for some kindness rendered by Asclepius, a snake licked Asclepius’ ears clean and taught him secret knowledge. Asclepius bore a rod wreathed with a snake, which associated with healing. A species of non-venomous pan-Mediterranean serpent, the Aesculapian snake is named for the god, Asclepius became so proficient as a healer that he surpassed both Chiron and his father, Apollo. Asclepius was therefore able to evade death and to bring back to life from the brink of death. This caused an influx of human beings and Zeus resorted to killing him to balance in the numbers of the human population. Asclepius was married to Epione, with whom he had five daughters, Hygieia, Panacea, Aceso, Iaso, and Aglaea and he also sired a son, Aratus, with Aristodama. At some point, Asclepius was among those who took part in the Calydonian Boar hunt, Zeus killed Asclepius with a thunderbolt because he brought Hippolytus back alive from the dead and accepted gold for it. This angered Apollo who in turn killed the Cyclopes who made the thunderbolts for Zeus, for this act, Zeus suspended Apollo from the night sky and commanded Apollo to serve Admetus, King of Thessaly for a year
5.
Amphitrite
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In ancient Greek mythology, Amphitrite was a sea goddess and wife of Poseidon. Under the influence of the Olympian pantheon, she merely the consort of Poseidon and was further diminished by poets to a symbolic representation of the sea. In Roman mythology, the consort of Neptune, a minor figure, was Salacia. Others called her the personification of the sea itself, Amphitrites offspring included seals and dolphins. Poseidon and Amphitrite had a son, Triton who was a merman, bibliotheca also mentions a daughter of Poseidon and Amphitrite named Benthesikyme. Amphitrite is not fully personified in the Homeric epics, out on the sea, in Amphitrites breakers. She shares her Homeric epithet Halosydne with Thetis in some sense the sea-nymphs are doublets, jane Ellen Harrison recognized in the poetic treatment an authentic echo of Amphitrites early importance, It would have been much simpler for Poseidon to recognize his own son. Even so late as the Iliad Amphitrite is not yet Neptuni uxor, an exception may be the cult image of Amphitrite that Pausanias saw in the temple of Poseidon at the Isthmus of Corinth. Pindar, in his sixth Olympian Ode, recognized Poseidons role as god of the sea, husband of Amphitrite. For later poets, Amphitrite became simply a metaphor for the sea, Euripides, in Cyclops and Ovid, eustathius said that Poseidon first saw her dancing at Naxos among the other Nereids, and carried her off. In the arts of vase-painting and mosaic, Amphitrite was distinguishable from the other Nereids only by her queenly attributes and she is dressed in queenly robes and has nets in her hair. The pincers of a crab are sometimes attached to her temples. Amphitrite is the name of a genus of the worm family Terebellidae, in poetry, Amphitrites name is often used for the sea, as a synonym of Thalassa. Seven ships of the Royal Navy were named HMS Amphitrite, including Amphitrite, at least one ship of the Royal Netherlands Navy was named HM Amphitrite. Three ships of the United States Navy were named USS Amphitrite, an asteroid,29 Amphitrite, is named for her. The figure of Amphitrite plays a role in the 1918 Spanish novel Mare Nostrum by Vicente Blasco Ibáñez and its 1926 film adaptation. In 1936 Australia used an image of Amphitrite on a stamp as a classical allusion for the submarine communications cable across Bass Strait from Apollo Bay, Victoria to Stanley. The name of the former Greek Royal Yacht, Amphitrite Pool, a shallow ceremonial pool on the grounds of the United States Merchant Marine Academy at Kings Point, New York contains a statue of Amphitrite
6.
Naiad
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In Greek mythology, the Naiads are a type of female spirit, or nymph, presiding over fountains, wells, springs, streams, brooks and other bodies of fresh water. They are distinct from gods, who embodied rivers. Arethusa, the nymph of a spring, could make her way through subterranean flows from the Peloponnesus, the Greek word is Ναϊάς, plural Ναϊάδες It derives from νάειν, to flow, or νᾶμα, running water. Naiad has several English pronunciations, /ˈneɪæd/, /ˈneɪəd/, /ˈnaɪæd/, /ˈnaɪəd/ and they were often the object of archaic local cults, worshipped as essential to humans. Boys and girls at coming-of-age ceremonies dedicated their childish locks to the local naiad of the spring, in places like Lerna their waters ritual cleansings were credited with magical medical properties. Oracles might be situated by ancient springs, Naiads could be dangerous, Hylas of the Argos crew was lost when he was taken by naiads fascinated by his beauty. The naiads were also known to exhibit jealous tendencies, salmacis forced the youth Hermaphroditus into a carnal embrace and, when he sought to get away, fused with him. The loves and rapes of Zeus, according to Graves readings, so, in the back-story of the myth of Aristaeus, Hypseus, a king of the Lapiths, married Chlidanope, a naiad, who bore him Cyrene. Aristaeus had more than ordinary mortal experience with the naiads, when his bees died in Thessaly and his aunt Arethusa invited him below the waters surface, where he was washed with water from a perpetual spring and given advice. St. Charles Avenue in New Orleans was formerly known as Nyades Street, and is parallel to Dryades Street. Crinaeae Eleionomae Limnades or Limnatides Pegaeae Potameides Bibliotheca 2.95,2.11,2.21,2.23,1.61,1.81,1.7.6 Homer. Odyssey 13.355,17.240, Iliad 14.440,20.380 Ovid, theogony Burkert, Walter, Greek Religion, Harvard University Press,1985. Robert Graves, The Greek Myths 1955 Edgar Allan Poe, Sonnet to Science 1829 The Naiades Naiad Nymphs
7.
Oceanus
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Strictly speaking, Oceanus was the ocean-stream at the Equator in which floated the habitable hemisphere. Thus, the sun rises from the deep-flowing Oceanus in the east, in Greek mythology, this world-ocean was personified as a Titan, the eldest son of Uranus and Gaia. In Hellenistic and Roman mosaics, this Titan was often depicted as having the body of a muscular man with a long beard and horns. In Roman mosaics, such as that from Bardo he might carry a steering-oar, some scholars believe that Oceanus originally represented all bodies of salt water, including the Mediterranean Sea and the Atlantic Ocean, the two largest bodies known to the ancient Greeks. Oceanus consort is his sister Tethys, and from their union came the ocean nymphs, also referred to as the three-thousand Oceanids, and all the rivers of the world, fountains, and lakes. In most variations of this myth, Oceanus also refused to side with Cronus in the revolt against their father. R. S. P. Beekes has suggested a Pre-Greek proto-form *-kay-an-, when Odysseus and Nestor walk together along the shore of the sounding sea they address their prayers to the great Sea-god who girdles the world. It is to Oceanus, not to Poseidon, that their thoughts are directed, Heracles forced Helios to lend him his golden bowl, in order to cross the wide expanse of the Ocean on his trip to the Hesperides. When Oceanus tossed the bowl about, Heracles threatened him and stilled his waves, the journey of Heracles in the sun-bowl upon Oceanus became a favored theme among painters of Attic pottery. Oceanus appears in Hellenic cosmography as well as myth, cartographers continued to represent the encircling equatorial stream much as it had appeared on Achilles shield. Apollonius of Rhodes calls the lower Danube the Keras Okeanoio in Argonautica, accion in the fourth century Gaulish Latin of Rufus Avienus, Ora maritima, was applied to great lakes. At the end of the Okeanos Potamos, is the island of Alba, sacred to the Pelasgian Apollo. Hecateus of Abdera refers to Apollos island from the region of the Hyperboreans and it was on Leuke, in one version of his legend, that the hero Achilles, in a hilly tumulus, was buried. Leto, the Hyperborean goddess, after nine days and nine nights of labour on the island of Delos gave birth to the god of the antique light. Old Romanian folk songs sing of a monastery on a white island with nine priests, nine singers, nine altars. Oceanid Ogyges Rasā Uranus Aeschylus, Persians, edited and translated by Alan H. Sommerstein. Cambridge, MA, Harvard University Press,2009, online version at Harvard University Press. Apollodorus, Apollodorus, The Library, with an English Translation by Sir James George Frazer, Cambridge, MA, Harvard University Press, London, William Heinemann Ltd.1921
8.
Poseidon
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Poseidon was one of the twelve Olympian deities of the pantheon in Greek mythology. His main domain was the ocean, and he is called the God of the Sea, additionally, he is referred to as Earth-Shaker due to his role in causing earthquakes, and has been called the tamer of horses. He is usually depicted as a male with curly hair. The name of the sea-god Nethuns in Etruscan was adopted in Latin for Neptune in Roman mythology, both were sea gods analogous to Poseidon. According to some folklore, he was saved by his mother Rhea, who concealed him among a flock of lambs and pretended to have birth to a colt. There is a Homeric hymn to Poseidon, who was the protector of many Hellenic cities, according to the references from Plato in his dialogues Timaeus and Critias, the island of Atlantis was the chosen domain of Poseidon. The form Ποτειδάϝων appears in Corinth, the origins of the name Poseidon are unclear. Walter Burkert finds that the second element da- remains hopelessly ambiguous, another theory interprets the second element as related to the word *δᾶϝον dâwon, water, this would make *Posei-dawōn into the master of waters. There is also the possibility that the word has Pre-Greek origin, Plato in his dialogue Cratylus gives two alternative etymologies, either the sea restrained Poseidon when walking as a foot-bond, or he knew many things. If surviving Linear B clay tablets can be trusted, the name occurs with greater frequency than does di-u-ja. A feminine variant, po-se-de-ia, is found, indicating a lost consort goddess. Poseidon carries frequently the title wa-na-ka in Linear B inscriptions, as king of the underworld, the chthonic nature of Poseidon-Wanax is also indicated by his title E-ne-si-da-o-ne in Mycenean Knossos and Pylos, a powerful attribute. In the cave of Amnisos Enesidaon is related with the cult of Eileithyia and she was related with the annual birth of the divine child. During the Bronze Age, a goddess of nature, dominated both in Minoan and Mycenean cult, and Wanax was her companion in Mycenean cult. It is possible that Demeter appears as Da-ma-te in a Linear B inscription, in Linear B inscriptions found at Pylos, E-ne-si-da-o-ne is related with Poseidon, and Si-to Po-tini-ja is probably related with Demeter. Tablets from Pylos record sacrificial goods destined for the Two Queens, the Two Queens may be related with Demeter and Persephone, or their precursors, goddesses who were not associated with Poseidon in later periods. The violated Demeter was Demeter Erinys, in Arcadia, Demeters mare-form was worshiped into historical times. Her xoanon of Phigaleia shows how the local cult interpreted her, a Medusa type with a horses head with snaky hair, holding a dove and a dolphin, probably representing her power over air and water
9.
Tethys (mythology)
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In Greek mythology, Tethys, was a Titan daughter of Uranus and Gaia, and the wife of her brother the Titan-god Oceanus, and the mother by him of the river gods and the Oceanids. Tethys had no role in Greek mythology, and no established cults. Tethys was one of the Titan offspring of Uranus and Gaia, Hesiod lists her Titan syblings as Oceanus, Coeus, Crius, Hyperion, Iapetus, Theia, Rhea, Themis, Mnemosyne, Phoebe, and Cronus. Tethys married her brother, Oceanus, an enormous river encircling the world, and was, by him, the mother of sons, who were river-gods. According to Hesiod, there were three thousand river-gods, also according to Hesiod, there were three thousand Oceanids. Passages in a section of the Iliad called the Deception of Zeus, suggest the possibility that Homer knew a tradition in which Oceanus and Tethys were the parents of the Titans. Twice Homer has Hera describe the pair as Oceanus, from whom the gods are sprung, however, for M. L. West, these lines suggests a myth in which Oceanus and Tethys are the first parents of the whole race of gods. Tethys played no part in Greek mythology, the only early story concerning Tethys, is what Homer has Hera briefly relate in the Iliads Deception of Zeus passage. Hera relates this while dissembling that she is on her way to visit Oceanus and Tethys, in hopes of reconciling her foster parents, who angry with each other, are no longer having sexual relations. Originally Oceanus consort, at a later time Tethys came to be identified with the sea, in Ovids Metamorphoses, Tethys turns Aesacus into a diving bird. Tethys was sometimes confused with another sea goddess, the sea-nymph Thetis and this possible correspondence between Oceanus and Tethys, and Apsū and Tiamat, has been noticed by several authors, with Tethys name possibly having been derived from that of Tiamat. Representations of Tethys prior to the Roman period are rare, Tethys appears, identified by inscription, as part of an illustration of the wedding of Peleus and Thetis on the early sixth century BC Attic black-figure Erskine dinos by Sophilos. Tethys, accompanied by Eileithyia, the goddess of childbirth, follows close behind Oceanus, Tethys is also conjectured to be represented in a similar illustration of the wedding of Peleus and Thetis depicted on the early sixth century BC Attic black-figure François Vase. Tethys probably also appeared as one of the fighting the Giants in the Gigantomachy frieze of the second century BC Pergamon Altar. Only fragments of the figure remain, a part of a chiton, below Oceanus left arm, the above are the only artistic representations of Tethys known prior to the Roman period. Her identifying attributes are wings sprouting from her forehead, a rudder/oar, and a ketos, a creature from Greek mythology with the head of a dragon and the body of a snake. The earliest of these mosaics, identified as Tethys, decorated a triclinium overlooking a pool, excavated from the House of the Calendar in Antioch, dated to shortly after AD115. Tethys, reclining on the left, with Oceanus reclining on the right, has long hair, a ketos twines around her raised right arm
10.
Thetis
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Thetis, is encountered in Greek mythology mostly as a sea nymph or known as the goddess of water, one of the 50 Nereids, daughters of the ancient sea god Nereus. When described as a Nereid in Classical myths, Thetis was the daughter of Nereus and Doris, often she seems to lead the Nereids as they attend to her tasks. Sometimes she also is identified with Metis, some sources argue that she was one of the earliest of deities worshipped in Archaic Greece, the oral traditions and records of which are lost. Only one written record, a fragment, exists attesting to her worship, worship of Thetis as the goddess is documented to have persisted in some regions by historical writers such as Pausanias. In the Trojan War cycle of myth, the wedding of Thetis, the pre-modern etymology of her name, from tithemi, to set up, establish, suggests a perception among Classical Greeks of an early political role. Walter Burkert considers her name a transformed doublet of Tethys and you, goddess, went and saved him from that indignity. You quickly summoned to high Olympus the monster of the hundred arms whom the gods call Briareus, but mankind Aegaeon and he squatted by the Son of Cronos with such a show of force that the blessed gods slunk off in terror, leaving Zeus free —E. V. M. Willcock, have understood the episode as an ad hoc invention of Homers to support Achilles request that his mother intervene with Zeus, thus, she is revealed as a figure of cosmic capacity, quite capable of unsettling the divine order. These accounts associate Thetis with a divine past—uninvolved with human events—with a level of divine invulnerability extraordinary by Olympian standards. In order to ensure a mortal father for her offspring, Zeus and his brother Poseidon made arrangements for her to marry a human, Peleus, son of Aeacus. Proteus, an early sea-god, advised Peleus to find the sea nymph when she was asleep and she did shift shapes, becoming flame, water, a raging lioness, and a serpent. Subdued, she consented to marry him. Thetis is the mother of Achilles by Peleus, who became king of the Myrmidons, apollo played the lyre and the Muses sang, Pindar claimed. At the wedding Chiron gave Peleus an ashen spear that had been polished by Athene and had a blade forged by Hephaestus, Poseidon gave him the immortal horses, Balius and Xanthus. Eris, the goddess of discord, had not been invited and she threw, in spite, a golden apple into the midst of the goddesses that was to be awarded only to the fairest. In most interpretations, the award was made during the Judgement of Paris, in the later classical myths Thetis worked her magic on the baby Achilles by night, burning away his mortality in the hall fire and anointing the child with ambrosia during the day, Apollonius tells. When Peleus caught her searing the baby, he let out a cry, in a variant of the myth, Thetis tried to make Achilles invulnerable by dipping him in the waters of the Styx. However, the heel by which she held him was not touched by the Styxs waters, in the story of Achilles in the Trojan War in the Iliad, Homer does not mention this weakness of Achilles heel
11.
Sea
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A sea is a large body of salt water that is surrounded in whole or in part by land. More broadly, the sea is the system of Earths salty. The sea moderates Earths climate and has important roles in the cycle, carbon cycle. Although the sea has been traveled and explored since prehistory, the scientific study of the sea—oceanography—dates broadly to the British Challenger expedition of the 1870s. Owing to the present state of continental drift, the Northern Hemisphere is now equally divided between land and sea but the South is overwhelmingly oceanic. Salinity in the ocean is generally in a narrow band around 3. 5% by mass, although this can vary in more landlocked waters, near the mouths of large rivers. About 85% of the solids in the sea are sodium chloride. Deep-sea currents are produced by differences in salinity and temperature, surface currents are formed by the friction of waves produced by the wind and by tides, the changes in local sea level produced by the gravity of the Moon and Sun. The direction of all of these is governed by surface and submarine land masses, former changes in sea levels have left continental shelves, shallow areas in the sea close to land. The most diverse areas surround great tropical coral reefs, whaling in the deep sea was once common but whales dwindling numbers prompted international conservation efforts and finally a moratorium on most commercial hunting. Life may have started there and aquatic microbial mats are generally credited with the oxygenation of Earths atmosphere, the sea is an essential aspect of human trade, travel, mineral extraction, and power generation. It is the scene of activities including swimming, diving, surfing. However, population growth, industrialization, and intensive farming have all contributed to marine pollution. Atmospheric carbon dioxide is being absorbed in increasing amounts, lowering its pH in a known as ocean acidification. The shared nature of the sea has made overfishing an increasing problem, both senses of sea date to Old English, the larger sense has required a definite article since Early Middle English. Seas are generally larger than lakes and contain salt water, while the defining elements of size and being bounded are generally used, there is no formally accepted technical definition of sea among oceanographers. In international law, the United Nations Convention on the Law of the Sea states that all the ocean is the sea. Earth is the known planet with seas of liquid water on its surface, although Mars possesses ice caps
12.
Earth
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Earth, otherwise known as the World, or the Globe, is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets, according to radiometric dating and other sources of evidence, Earth formed about 4.54 billion years ago. Earths gravity interacts with objects in space, especially the Sun. During one orbit around the Sun, Earth rotates about its axis over 365 times, thus, Earths axis of rotation is tilted, producing seasonal variations on the planets surface. The gravitational interaction between the Earth and Moon causes ocean tides, stabilizes the Earths orientation on its axis, Earths lithosphere is divided into several rigid tectonic plates that migrate across the surface over periods of many millions of years. About 71% of Earths surface is covered with water, mostly by its oceans, the remaining 29% is land consisting of continents and islands that together have many lakes, rivers and other sources of water that contribute to the hydrosphere. The majority of Earths polar regions are covered in ice, including the Antarctic ice sheet, Earths interior remains active with a solid iron inner core, a liquid outer core that generates the Earths magnetic field, and a convecting mantle that drives plate tectonics. Within the first billion years of Earths history, life appeared in the oceans and began to affect the Earths atmosphere and surface, some geological evidence indicates that life may have arisen as much as 4.1 billion years ago. Since then, the combination of Earths distance from the Sun, physical properties, in the history of the Earth, biodiversity has gone through long periods of expansion, occasionally punctuated by mass extinction events. Over 99% of all species that lived on Earth are extinct. Estimates of the number of species on Earth today vary widely, over 7.4 billion humans live on Earth and depend on its biosphere and minerals for their survival. Humans have developed diverse societies and cultures, politically, the world has about 200 sovereign states, the modern English word Earth developed from a wide variety of Middle English forms, which derived from an Old English noun most often spelled eorðe. It has cognates in every Germanic language, and their proto-Germanic root has been reconstructed as *erþō, originally, earth was written in lowercase, and from early Middle English, its definite sense as the globe was expressed as the earth. By early Modern English, many nouns were capitalized, and the became the Earth. More recently, the name is simply given as Earth. House styles now vary, Oxford spelling recognizes the lowercase form as the most common, another convention capitalizes Earth when appearing as a name but writes it in lowercase when preceded by the. It almost always appears in lowercase in colloquial expressions such as what on earth are you doing, the oldest material found in the Solar System is dated to 4. 5672±0.0006 billion years ago. By 4. 54±0.04 Gya the primordial Earth had formed, the formation and evolution of Solar System bodies occurred along with the Sun
Chisholm, Hugh, ed. (1911). . Encyclopædia Britannica (11th ed.). Cambridge University Press.
Chisholm, Hugh, ed. (1911). 