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NECK (O. Eng. hnecca; the word appear...

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Originally appearing in Volume V19, Page 336 of the 1911 Encyclopedia Britannica.
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NECK (O. Eng. hnecca; the word appears in many See also:Teutonic See also:languages; cf. Dutch ride, Ger. Nacken; in O. E. the See also:common word was heals; cf. Ger. See also:Hals)  , that See also:part of the See also:body which connects the See also:head with the See also:trunk (see See also:ANATOMY: Superficial and See also:Artistic) . The word is transferred to many See also:objects resembling this part of the body in shape or See also:function; it is thus applied to an See also:isthmus, or to the narrowest portion of a promontory, to the narrow part of a musical stringed See also:instrument connecting the head and body, as in the See also:violin, or to a narrow pass between mountains, which in the Dutch See also:form nek, appears in See also:place-names in See also:South See also:Africa . In See also:architecture, the " See also:neck " is that part of the See also:capital just above the " See also:astragal," and the See also:term " necking " is applied to the annulet or See also:round, or See also:series of See also:horizontal See also:mouldings, which separates the capital of a See also:column from the See also:plain part or a See also:shaft . In Romanesque See also:work this is sometimes corded . In See also:Geology, the term " neck " is given to the denuded stump of an See also:extinct See also:volcano . Beneath every volcano there are passages of conduits up which the volcanic materials were forced, and after the See also:mass has been levelled by denudation there is always a more or less circular See also:pipe which marks the site of the See also:crater . This pipe, which is filled with consolidated ashes or with crystalline See also:lava, is the characteristic of a volcanic neck . Active volcanoes often stand on the See also:sea-bottom and when the eruption comes to an end the volcano is slowly buried under layers of sediment . In tropical seas the See also:coral animals See also:cover over the submarine volcanoes which rise nearly to the See also:surface and form See also:great reefs of See also:limestone around them . Should See also:elevation take place after See also:long ages the removal of the overlying strata will bring the volcanic mass to See also:light, and in the normal course of things this will suffer denudation exactly like a See also:recent volcano . Many instances of this are furnished by the See also:geological See also:history of the See also:British Isles . In Carboniferous times, for example, before the See also:Coal-See also:measures were deposited, a shallow sea occupied the See also:southern part of See also:Scotland and the See also:north of See also:England .

Volcanic activity See also:

broke out on the sea-bottom, and many volcanic cones, both small and large, were produced . These have long since been uplifted and the superjacent strata denuded away over a large part of the See also:area which they occupied . In See also:Derbyshire, See also:Fife, the Lothians and the See also:Glasgow See also:district the remains of Carboniferous volcanoes occur in every See also:state of preservation . Some have the conical hills of lavas and ashes well preserved (e.g . Largo See also:Law in Fifeshire) ; others retain only a small part of the See also:original volcanic See also:pile (e.g . See also:Arthur's Seat, See also:Edinburgh; the Binn of See also:Burntisland) and of the larger number nothing remains but the " neck " which shows where once the crater was situated . In regions of former volcanic activity necks are the most persisterlt of all volcanic structures, because the active volcanic magma Is located deep within the See also:earth's crust, and the pipe by which it rigs to the surface is of great length and traverses a great thickness of strata . Many volcanic necks stand on lines of See also:fault . In other cases have fallen down from strata once occupying part of the walls of the crater but now removed by denudation . The lava which rises and flows out from the crater leaves its trace also in the necks . Sometimes it forms thin beds or flows alternating with the tuffs and having the same See also:basin-shaped See also:dip . More commonly it appears as the material filling fissures and pipes, traversing the ashes irregularly or rising as a central plug in the interior of the neck, and sending out branching See also:veins .

Occasionally a whole neck is composed of solid crystalline See also:

rock representing the last part of the magma which ascended from the underground See also:focus and congealed within the crater . In Mont Pelee, for instance, the last See also:stage of the eruptions of 1902 to 1905 was the protrusion of a great column of solidified lava which See also:rose at one See also:time to a height of 900 ft. above the See also:lip of the crater, but has since crumbled down . The See also:Castle Pock of Edinburgh is a neck occupied by a plug of crystalline See also:basalt . Necks of this See also:kind See also:weather down very slowly and tend to form prominent hills . After the eruptions terminate gases or hot solutions given out by deep-lying masses of molten rock may find a passage upward through the materials occupying the crater, greatly modifying their See also:mineral nature and laying down fresh deposits . A See also:good example of secondary deposits within a volcanic neck is provided by the Cripple See also:Creek See also:mining district of See also:Colorado . The ore-bearing veins are connected with volcanic rocks and part of these occupy a See also:vertical circular pipe which is a typical volcanic neck . A phonolitic See also:breccia, greatly altered, is the See also:principal rock, and is cut by dikes of See also:phonolite, See also:dolerite, &c . The See also:country rock is mostly See also:granite and See also:gneiss, and blocks of these are See also:common in the breccia . A large volcano was built up in See also:Tertiary times on the granite See also:plateau, and has since been almost entirely removed by denudation . The See also:gold ores were carried upwards by currents of hot See also:water derived from the volcanic magma and were deposited along cracks and fissures in the materials which occupied the crater, and also in the surrounding rocks (see VOLCANO) . (J .

S .

End of Article: NECK (O. Eng. hnecca; the word appears in many Teutonic languages; cf. Dutch ride, Ger. Nacken; in O. E. the common word was heals; cf. Ger. Hals)
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ALEXANDER NECKAM (1157-1217)

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