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1. Itannica ital Learning IABILIDAD CALIDAD Guia del usuario Britannica ACADEMIC HOME BROWSE ADVOCACY HELP WORKSPACE e Aco Earns ACADEMIC Part of a Balanced Diet ES View Demos features september 21 2015 gt Jeremy Corbyn MEW gt Jackson Abe Shinzo 2 Falun Gong gt Saint Luke Thinkstock gt More Editor s Picks and Blog Posts BRITANNICA DIGITAL LEARNING Los mejores recursos digitales para su escuela Glick here to view demos of site Create Workspace i z Click here to create your workspace New 4 Revised Articles gt Sir Nicholas Winton NEW gt Iran gt Mohandas Karamchand Gandhi HBO gt Jeffrey Tambor NEW See all Bienvenido a Britannica Academic la base de datos completa de fuentes confiables ideal para cualquier uso acad mico Para ayudarle a incorporar este portal en sus actividades acad micas hemos creado esta gula del usuario con detalles sobre el uso y los contenidos de Britannica Academic Tambi n ofrecemos sesiones de capacitaci n online gratuitas para estudiantes y docentes Uno de nuestros expertos le guiar por el portal y explicar c mo utilizar todos sus recursos Visite nuestro sitio web para ver las sesiones disponibles y para registrarse http britannica es Resources html Estamos a sus rdenes para cualquier aclaraci n Saludos cordiales Equipo Britannica Encyclopzedia Britannica Inc 331 N LaSalle2. rainforests fringing reef geology of the sea coral reefs are home to a spectacular variety of organisms revistas E books fuentes primarias y sitios Web seleccionados por los editores de Britannica Web Search barrier reef geology A coral reef is actually a complex of features only part of which is a living coral or a algal framework although the coral invertebrate other associated features coral bleaching marine biology Additional Reading from the article Great Barrier h result from this live segment The accumulations of atoll coral reef carbonate sand and mud provide a habitat for sea grasses and mangroves and for almost Belize Barrier Reef sea fan inconspicuous blue green algal mats These plants and algae trap and stabilize sediment and their accumulations are also accreted to the whole reef complex Storms and surf heap up fragmental material into beaches and shoals and the shoals k may develop into low sandy or rubbly islets or cays IMAGES Citations Detenga el cursor sobre descripcion Sea fan genus Gorgonia a branching cr ditos o links para m s informaci n variety of coral beside an array of other organisms in the Belize Barrier Reef P gina de art culos HOME BROWSE ADVOCACY HELP gt WORKSPACE Advanced Search Britannica ACADEMIC Science amp Technology y Encyclop dia Britannica Table of Contents EDIT
3. Britannica Advanced Search ACADEMIC Science amp Technology ey Encyclopedia Britannica Video Images amp Audio Contributor Date z E Amy Tikkanen 21 May 2015 Related Articles Added video Ebooks amp Mora Added Edited contact info Kids Do Ecology World Biomes Coral Web Links Satyavrat Nirala 21 Dec 2014 Reef Verifique cuando Arista Hinay Add new Web site Untamed Science Biology Coral Reefs Biome Vivek Abhinav 13 Sep 2012 el art culo fue Contributors actualizado una Add new Web site Defenders of Wildlife Coral Reef Gloria Lotha 20 Aug 2012 nn Dictionary amp descripcion de Literno Add new Web site ThinkQuest Types of Reef Parul Jain 24 Nov 2011 U lt gt Z 2 lt Re LLI JE la actualizaci n y su autor Haga clic sobre el nombre de los colaboradores para ver una breve biograf a Workspace Added photographs Amy Tikkanen 18 Nov 2011 Widgets Add new Web site The Nature Conservancy Coral Reef Grace Young 03 Oct 2011 Add new Web site Buzzle com Coral Reef Grace Young 03 Oct 2011 Add new Web site World Wildlife Fund Coral Reefs Grace Young 03 Oct 2011 Add new Web site United States Geological Survey Coral Reef Swati Chopra 29 Sep 2011 SO SSL Lo ve rereererer Add new Web site British Broadcasting Corporation Coral Reef Swati Chopra 29 Sep 2011 Herramientas para los colaboradores Usted puede sugerir Cambios contribuir N
4. SAVE PRINT EMAL A Ar Video Images amp Audio VIDEOS Coral reef CM rom the Encyclop dia Britannica Related Articles Ebooks amp More ll Get involved 2 share F2 6 10 Coral reef ridge or hummock formed in shallow ocean areas by algae and the calcareous skeletons of certain coelenterates of which coral polyps are the most important A coral reef may grow into a permanent coral island Web Links Article History Corals and other reef building organisms Coral polyps resemble sea anemones to which they are closely related but unlike most anemones most reef corals are colonial Initial polyps divide themselves into daughter polyps and they divide in tum growing into colonies that can be up to several metres in diameter all held together in one continuous rigid calcareous skeleton They remain attached to the seafloor and become so large and heavy that only storms disturb them Under the right conditions generally clear and well circulating water that is not too rough the corals grow profusely side by side even on and over each other The corals in effect build limestone because their skeletons are made of calcium carbonate Contributors IMAGES ER Often called the rainforests of the sea coral reefs are home to a spectacular variety of organisms Dicti amp a Structure SE fis Video Animation Workspace A coral reef is actually a complex of features only part of which is a liv
5. St Chicago IL 60654 1 312 347 7000 latinamerica eb com britannica es Britannica ACADEMIC Britannica Academic fue dise ada especificamente para cumplir con los requisitos de investigaci n y productividad de universidades y bibliotecas acad micas Los estudiantes y profesores disfrutar n de varios recursos desde una sola base de datos constantemente actualizada Britannica cuenta con un equipo de editores altamente calificados y una de las m s extensas redes de colaboradores Los contribuyentes incluyen ganadores de los premios Nobel y Pulitzer presidentes de varios pa ses as como acad micos y expertos de renombre mundial lo que garantiza informaci n actualizada precisi n imparcialidad y pertinencia a nivel global Los estudiantes aprenden directamente con expertos Debido a los cambios constantes en las diversas reas del conocimiento cada a o nuestro equipo editorial a ade M s de 15 000 art culos nuevos y actualizados Miles de gr ficos M s de 5 000 im genes E books amp Cientos de ilustraciones y videos nuevos Primary Sources View Demos Click here to view d features Selected New garba Guinea Bissau Hilary Putnam AZ Magazines NewOreans Sain More Editor s Picks and Blog Posts Biographies Media Collection Gemany Contributors Quotations Ebooks amp Primary Sources Subjects dep f Dictionary Extended Play Videos messi sie
6. about 4 and 15 C 39 and 59 F at depths of about 60 to 200 metres 200 to 650 feet In any one thicket there are commonly only hun nenera of delicately branching corals involved Such coral banks are known along the eastern Atlantic shelf edge or continental slope from Nonway to the Cape Verde islands and again off the Niger River delta and in the west Atlantic around the Gulf of Mexico The Bahamas and the Orinoco River delta Off New Zealand such banks have been recognized on the Campbell Plateau and the Chatham Rise They also occur in the northwest Pacific near Japan The third coral assemblage of the modern seas is associated with even colder or deeper seas It consists of small solitary corals of relatively few genera known from the abyssal floors of the oceans and from the shelves around Antarctica Patagonia and the Falkland Islands in waters 2 to 6 C 36 to 43 F in temperature Calcareous algae stony seaweeds mollusks echinoderms and protozoans also contribute to the reef Different organisms have different reef building roles Some especially the corals provide the main structural framework of the growing reef although in parts of the world such as the central Pacific where the surf is very strong calcareous algae may be more important in the roughest places Almost all shelly and calcareous organisms and those with spicules such as sponges and sea cucumbers provide fragments that wash into or fall into the gaps b
7. the Dictionary tab for access to a world of information Britannica The Online Encyclopedia A 335 gt gt gt a Zz gt m Z 0 O Los mapas interactivos permiten una Facil exploracion de las regiones del mundo Otros recursos incluyen herramientas de geografia como un atlas interactivo cronogramas acontecimientos historicos presentados diariamente y opciones de navegacion P gina de resultados de la b squeda Comience aqu una nueva b squeda HOME BROWSE ADVOCACY HELP Britannica CE ACADEMIC Search Results coral reef AA Detenga el cursor sobre el Encyclopadia coral reef geology titulo del articulo deseado para ver Year In Review el resumen Diobionarny del articulo Buccoo Coral Reef reef Trinidad and Tobago Virgin Islands Coral Reef National Monument nal CO la re ef platform reef coral reef a AMA from the Encyclopedia Britannica 7 Thesaurus lt O LU O N DI Busq ue mas coral reef lagoon landform Coral reef fidge or informacion F hummock formed in shallow sobre su tema Reef mounds and coral biostromes from the artic scan areas by algae and the o calcareous skeletons of de inter s en Primary Sources John Pennekamp Coral Reef State Park park Fle certain coelenterates of which coral polyps are the ribbon reef coral reef most important A coral reef may grow into a permanent coral island Often called the
8. OEL wens sus materiales ver la Britannica nn Du Facts matter evaluacion de esas e i i Science amp Technology amp Encyclop dia Britannica 5 contribuciones por parte de los editores Mid 2 de Britannica y ver Projecte Al i ECC EI cs i i Related Articles All the workspace projects las contribuciones Ebooks amp More acep tadas Web Links Type Title Description Date Project HOME BROWSE BLOG ADVOCACY HELP Giant panda Ailuropoda melanoleuca Article History IMAGE giant panda 08 22 2012 Default feeding on bamboo Contributors giant panda 08 22 2012 Default Dictionary amp Easter Island 08 22 2012 Default Easter Island 08 22 2012 Default Guarde el contenido deseado en el Workspace una herramienta util para tomar notas modificar y personalizar lo que ha guardado ademas de compartirlo con otros Sea fan genus Gorgonia a branching IMAGE Belize Barrier Reef sea fan variety of coral beside an array of other 08 22 2012 Default organisms in the Belize Barrier Reef Logotipo Para ayudar a promover el uso de Britannica Academic en su universidad le ofrecemos el logotipo del portal para su uso Utilicelo en el sitio de su instituci n educativa para crear link que facilitar el acceso a Britannica Academic Visite nuestro sitio web para descargar el logotipo http britannica es Resources ht
9. and eomm amp Thesaurus New Compare Countries Side by side comparisons of countries Multimedia amp Spotlights Psu Britannica 3 Y rx Table of Contents v af Antarctica o nm Primary Contributor Arthur B Ford GuLi from the Encyclopedia Britannica Antarctica fifth in size among the world s continents ts landmass is almost who Lying almost concentrically around the South Pole Antarctica continent a circumstance that has had momentous consequenct million square km and would be essentially circular except for the South America some 600 miles 970 km away and for two prince embayments of the southernmost Pacific and Atlantic oceans make ti The larger is generally known as East Antarctica because most of it da BBC NY Times Timelines Eh called West Antarctica East and West Antarctica are separated by tt gt o m nm consists largely of a high ice covered plateau West Antarctica cons by ice The continental ice sheet contains approximately 7 million cubic miles total The average thickness is about 1 5 miles 2 45 km Many par floating on the sea These shelves the Ross Ice Shelf and the margins constitute about 10 percent of the area of Antarctic ice or discharge icebergs into the seas Because of this vast ice the continent supports only a prim sea is as rich in life as the land is barren With the decl
10. etween corals Other organisms especially algae and protozoans bind and cement everything together with sheetlike growth Orientation and arrangement A typical coral reef generally faces the open sea Seaward of it is the fore reef descending into deeper water and floored deeper down by fragmental material derived from the reef Behind the growing fore reef edge or reef crest which rises to about mean high water level is a shallow platform formed partly by a now dead area of reef framework and partly of fragmental material and often colonized by sea grasses algal mats or mangroves Patches of living framework occur intermittentiy Cays may occur along the platform or the reef may terminate against the shore of a landmass If there is no immediately adjacent landmass the reef descends again into deeper water generally more gently on this its leeward side There are usually live reef frameworks on this slope too but these are often irregular and patchy Sedimentation The reef becomes true rock by an almost imperceptible dissolution redeposition recrystallization and chemical transformation of reef material The shape of coral reefs while at least in part due to the tendency of reef builders to grow upward and outward toward the prevailing winds and currents is also the result of changes of sea level during the last 2 000 000 years or more Coral reefs that developed before the last glaciation were left above sea level where they were e
11. ine exports the results of scientific investigations that lea investigation of Antarctica began with the Internat to territorial claims modern ones have come u Al E landmark in diplomacy when it was signe Antarctica the most remote an mapped and visited gt H can Presidency Interactive World Atlas Welcome to Encyclop dia Britannica s the American Presidency Presidents Read about Pres Barack Obama and his st Ladies predecessors and explore the electoral proce grea Election election results images video and importan l documents related to the evolution of the nat TN Special Essays amp i dies e erie highest office Collection Political Parties Select a link on the left to begin exploring the Monuments amp Memorials ource Documents morabilia o amp Video 2013 F Bienvenido a Britannica Academic Escriba una palabra o frase y haga clic en GO Ir La funci n autocompletar le ayudar a encontrar m s resultados N WORKSPACE ROWS ADVOCACY IELP Advanced Search REAS ca ACADEMIC Create Workspace Click here to create your workspace Part of a Balanced Diet View Demos Click here to view demos of site E features u New amp Revised Articles September 21 2015 gt More Editor s Picks and Blog Posts gt AZ gt Biographies gt Contributors gt gt Resea
12. ing coral or algal framework although the other al Widgets dica associated features result from this live segment The accumulations of carbonate sand and mud provide a habitat for ES JEST gt oer 7 sea grasses and mangroves and for almost inconspicuous blue green algal mats These plants and algae trap and PTA stabilize sediment and their accumulations are also accreted to the whole reef complex Storms and surf heap up fragmental material into beaches and shoals and the shoals may develop into low sandy or rubbly islets or cays on D A top of the reef gt i wr Reef building corals chiefly the stony corals or Scleractinia grow best in shallow sunlit water between the low water mark and a depth of 11 metres 36 feet but they can still construct reefs in water as deep as 40 metres about 130 feet and they may have a sparse existence between 40 and 55 metres 130 and 180 feet These corals prefer water of normal salinity with an annual maximum temperature above 22 C 72 F but below 28 C about 82 F Their reef building activities however may be carried on in waters whose minimum temperature in winter is not less than 15 C 59 F A second group of corals in present day seas grows in thickets and coppices that develop banks rather than reefs on the outer deeper colder and darker parts of continental shelves and platforms These organisms flourish in water with a winter minimum temperature ranging between
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15. roded and subjected to solution weathering As sea level rose again during the past 10 000 years new reef growth mantled this older drowned landscape but has still not masked it completely Encuentre la historia de actualizaci n de los art culos los recursos multimedia y otras herramientas tiles en la barra lateral Si necesita hacer referencia a un art culo en un trabajo le proporcionamos la cita correctamente me formateada en varios estilos lt http academic eb com EBchecked topic 137083 coral reef gt EXPORT CITATIONS Utilice el menu desplegable para buscar informacion deseada en la tabla de contenido de los articulos y en otras aplicaciones Haga clic aqui para guardar su seleccion en el Workspace Espacio de Trabajo donde es facil de almacenar y compartir su informacion El texto del articulo aparece en el centro de la pagina Los enlaces le llevar n a otros art culos de Britannica con un solo clic To cite this page MLA APA Harvard Chicago Manual of Style coral reef Encyclopaedia Britannica Britannica Academic Encyclop dia Britannica Inc 2015 Web 21 Sep 2015 While every effort has been made to follow citation style rules there may be some discrepancies Please refer to the appropriate style manual or other sources if you have any questions m rm gt A AO C E O Historia de actualizaci n de los art culos HOME BROWSE ADVOCACY HELP P WORKSPACE
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