43 résultats pour "glaciales"

• Periodos glaciales - ciencias de la naturaleza.

  paleomagnéticas indican que entonces el polo sur yacía sobre el oeste de África. Hace unos 600 millones de años, se produjo otro periodo glacial. Las capas de tillita, rocaformada por el endurecimiento de materia arrastrada por los glaciares (el acarreo glaciar o till), prueban la existencia de estos antiguos periodos glaciales. Véase también Glaciación. Microsoft ® Encarta ® 2009. © 1993--2008 Microsoft Corporation. Reservados todos los derechos.

• Periodos glaciales - ciencias de la naturaleza.

  paleomagnéticas indican que entonces el polo sur yacía sobre el oeste de África. Hace unos 600 millones de años, se produjo otro periodo glacial. Las capas de tillita, rocaformada por el endurecimiento de materia arrastrada por los glaciares (el acarreo glaciar o till), prueban la existencia de estos antiguos periodos glaciales. Véase también Glaciación. Microsoft ® Encarta ® 2009. © 1993--2008 Microsoft Corporation. Reservados todos los derechos.

• Les deux extrémités de l'axe imaginaire autour duquel tourne la Terre sont, au pôleNord, l'océan Glacial arctique, recouvert d'une banquise, parfois fragmentée, et, au pôleSud, le continent antarctique, recouvert d'une épaisse calotte glaciaire.

  La zone polaire arctique. Cette zone comprend deux grands secteurs : le secteur américain, avec le Groenland et une multitude d'îles appartenant au Canada, de la terre de Baffin à la terre de Banks ; le secteur eurasien, avec des îles norvégiennes, comme le Spitzberg, et russes, comme la terre François-Joseph, la Nouvelle-Zemble, la Zemble du Nord, l'île de la Nouvelle-Sibérie et l'île Wrangel. Si l'on inclut les régions continentales situées dans les limites de l'isotherme + 10, la zone p...

• arctique (océan Glacial) - encyclopédie.

  arctique Barents (mer de) Behring (détroit de) Blanche (mer) Esquimaux Laptev (mer des) Melville Nord-Est (passage du) Nouvelle-Zemble océanographie - La connaissance de l'océan océanographie - Les masses d'eau et les courants océaniques pôles - L'homme à la conquête des pôles - Intérêt actuel des zones polaires pôles - L'homme à la conquête des pôles - L'exploration de l'Arctique pôles - Les zones ou régions polaires - Introduction pôles - Les zones ou régions polaires - La zone p...

• Glacial Lakes - geography.

• Océano Glacial Antártico - geografía.

• Océano Glacial Ártico - geografía.

  petróleo y gas natural en el norte de Alaska y Canadá, así como en el mar del Norte. Microsoft ® Encarta ® 2009. © 1993--2008 Microsoft Corporation. Reservados todos los derechos.

• Rusia - geografía.

  La frontera meridional de la Rusia europea comprende la joven cordillera del Cáucaso de gran actividad sísmica, que se extiende entre el mar Negro y el Caspio. Estacordillera abarca dos grandes cadenas de montañas con importantes plegamientos, divididas en toda su extensión por tierras bajas; la zona norte del Gran Cáucasoconstituye la frontera meridional de Rusia. Este sistema montañoso es bastante complejo desde el punto de vista geológico; está constituido por rocas calizas y cristalinascon a...

• Rusia - geografía.

  La frontera meridional de la Rusia europea comprende la joven cordillera del Cáucaso de gran actividad sísmica, que se extiende entre el mar Negro y el Caspio. Estacordillera abarca dos grandes cadenas de montañas con importantes plegamientos, divididas en toda su extensión por tierras bajas; la zona norte del Gran Cáucasoconstituye la frontera meridional de Rusia. Este sistema montañoso es bastante complejo desde el punto de vista geológico; está constituido por rocas calizas y cristalinascon a...

• Valley.

  Except in mountainous terrain, rivers are almost always flanked by floodplains. Floodplains are flat wide deposits of alluvium, river-deposited sediment, on either side of the river channel. During floods, a river overflows its banks and spreads out the sediment near the river to form a floodplain. Floodplains of large rivers, such as thoseof the Mississippi River, can be flat areas tens of kilometers across. River channels migrate back and forth across their floodplains as alluvium is repeate...

• Valley - Geography.

  Except in mountainous terrain, rivers are almost always flanked by floodplains. Floodplains are flat wide deposits of alluvium, river-deposited sediment, on either side of the river channel. During floods, a river overflows its banks and spreads out the sediment near the river to form a floodplain. Floodplains of large rivers, such as thoseof the Mississippi River, can be flat areas tens of kilometers across. River channels migrate back and forth across their floodplains as alluvium is repeate...

• New York - geography.

  The Adirondack province consists of a large highland area occupying 26,000 sq km (10,000 sq mi) in the northeastern quarter of the state. The region is domelike inshape, with the higher elevations toward the east. The western Adirondack province is more a rugged hill region and not truly mountainous. Geologically, this area isrelated to the Laurentian Upland, or Canadian Shield, which lies north of the St. Lawrence River, for it is composed of the same very old igneous rocks, principallygranite...

• New York - USA History.

  The Adirondack province consists of a large highland area occupying 26,000 sq km (10,000 sq mi) in the northeastern quarter of the state. The region is domelike inshape, with the higher elevations toward the east. The western Adirondack province is more a rugged hill region and not truly mountainous. Geologically, this area isrelated to the Laurentian Upland, or Canadian Shield, which lies north of the St. Lawrence River, for it is composed of the same very old igneous rocks, principallygranite...

• Minnesota - geography.

  C Climate Minnesota’s climate is classified as humid continental because normally there is a sufficient amount of precipitation to provide at least some surplus for runoff, andbecause Minnesota’s temperature conditions are largely controlled by its location in the interior of the large landmass of North America. The result is extreme seasonaltemperature variations. The average January temperature is about -18°C (about 0°F) in the northwest and about -10°C (about 14°F) in the south, but thetherm...

• Minnesota - USA History.

  C Climate Minnesota’s climate is classified as humid continental because normally there is a sufficient amount of precipitation to provide at least some surplus for runoff, andbecause Minnesota’s temperature conditions are largely controlled by its location in the interior of the large landmass of North America. The result is extreme seasonaltemperature variations. The average January temperature is about -18°C (about 0°F) in the northwest and about -10°C (about 14°F) in the south, but thetherm...

• Glacier.

  covered. In spring the snow cover begins to melt in the lower reaches, exposing the ice surface. As temperatures increase, the melting moves up the glacier. Thesnowline is the highest position the melting reaches during the year. Firn is old granular snow. The firn limit may not exactly coincide with the annual snowline since insome years rapid melting leaves behind firn patches below the snowline. Some glaciers exhibit features called ice streams and icefalls. Ice streams are valley glaciers th...

• Ice Ages.

  B Future Ice Ages The record of previous glacial activity is the best indicator for future ice ages. Scientists examine the evidence for the numerous 100,000-year glacial-interglacial cycleswithin the present ice age to attempt a forecast of future ice ages. Since all previous ice ages lasted tens of millions of years, our present ice age will likely continue fora considerable amount of time. Each glaciation begins slowly and may take 80,000 years or more to reach its maximum extent. A rapid me...

• Ohio - geography.

  conflict with modified Gulf air and causing frontal or cyclonic storms. Gulf air is dominant in summer. In fall, polar air passing over Lake Erie is modified, delaying thekilling frost along the adjacent shoreline. C1 Temperatures The mean annual temperatures for the state range from 9° C (48° F) in the northeast to 13° C (55° F) in the south. Average January temperatures range from -4° C(24° F) in the west to 2° C (35° F) in the south. July averages are 24° C (76° F) in the south and 23° C (73...

• Ohio - USA History.

  conflict with modified Gulf air and causing frontal or cyclonic storms. Gulf air is dominant in summer. In fall, polar air passing over Lake Erie is modified, delaying thekilling frost along the adjacent shoreline. C1 Temperatures The mean annual temperatures for the state range from 9° C (48° F) in the northeast to 13° C (55° F) in the south. Average January temperatures range from -4° C(24° F) in the west to 2° C (35° F) in the south. July averages are 24° C (76° F) in the south and 23° C (73...

• Iowa - geography.

  Okoboji, Lost Island, Silver, and West Swan lakes. In addition, reservoirs have been created by damming several smaller Iowa rivers. There are a number of largereservoirs behind dams on the Mississippi River along the Iowa state line. C Climate Iowa’s climate is characterized by warm, generally moist summers and cold winters. Temperatures vary considerably from season to season and, at times, from day today. However, monthly averages are relatively uniform throughout the state and usually vary...

• Iowa - USA History.

  Okoboji, Lost Island, Silver, and West Swan lakes. In addition, reservoirs have been created by damming several smaller Iowa rivers. There are a number of largereservoirs behind dams on the Mississippi River along the Iowa state line. C Climate Iowa’s climate is characterized by warm, generally moist summers and cold winters. Temperatures vary considerably from season to season and, at times, from day today. However, monthly averages are relatively uniform throughout the state and usually vary...

• faible défense contre le froid glacial à mille mètres d'altitude.

  l’Indien, jedécapite mongibier ; ducorps s’échappe unegraisse blanchâtre, quejegoûte nonsans hésitation : elleala consistance etlafinesse dubeurre, etlasaveur dulait denoix ducocotier.

• Oussama Ben Laden par Robert Fisk

  New York et à Washington, ces mots prennent un sens plus fort. Durant quelques minutes, la puissance américaine est devenueune ombre. Ben Laden m'a toujours semblé rechercher une célébrité qu'il n'a jamais trouvée - jusqu'à ce que les Américains et Time lequalifient de « parrain du terrorisme international », et jusqu'à ce que les Etats-Unis offrent une récompense de 5 millions dedollars pour sa tête (somme d'une faiblesse insultante pour un millionnaire comme lui, a-t-il peut-être pensé). Lo...

• New Mexico - geography.

  New Mexico’s major river is the Río Grande, originating in southern Colorado, and flowing southward for 760 km (470 mi) through the state. Between the San LuisValley and Española Valley the river flows in a deep canyon known as the Río Grande Gorge; then, below White Rock Canyon, it flows through several valleys containingagricultural land. Most of the water of the Río Grande is used to irrigate these valleys. The Río Grande’s waterflow in New Mexico is extremely low. One of the major tributarie...

• New Mexico - USA History.

  New Mexico’s major river is the Río Grande, originating in southern Colorado, and flowing southward for 760 km (470 mi) through the state. Between the San LuisValley and Española Valley the river flows in a deep canyon known as the Río Grande Gorge; then, below White Rock Canyon, it flows through several valleys containingagricultural land. Most of the water of the Río Grande is used to irrigate these valleys. The Río Grande’s waterflow in New Mexico is extremely low. One of the major tributarie...

• du premier wagon, où elle se mettait toujours pour être plus près de lui, il l'avait suppliée du regard  et, comprenant, elle s'était retirée, pour ne pas rester à ce vent glacial qui lui brûlait la figure.

  cabrait, necontinuait samarche quesous lamain volontaire dumécanicien. D'ungeste, celui-ci avait ouvert laporte dufoyer, pourquelechauffeur activâtlefeu. Et,maintenant, cen'était plus unequeue d'astre incendiant lanuit, c'était unpanache defumée noire,épaisse, qui salissait legrand frisson pâleduciel. La Lison avançait. Enfin,illui fallut entrer danslatranchée. Adroite etàgauche, lestalus étaient noyés,etl'on nedistinguait plusriendelavoie, aufond. C'était comme uncreux de torrent, oùlaneige dor...

• Samuel Hearne 1745-1792 Samuel Hearne, dès la deuxième moitié du XVIIIe siècle, ouvrit à l'exploration de la race blanche les territoires stériles qui terminent le continent américain sur les rives de l'océan Glacial.

  possibilités alimentaires étaient en grande partie subordonnées aux déplacements des caribous arctiques. Lorsque Samuel Hearne quitta le Fort Churchill, en novembre 1769, l'hiver était trop avancé déjà, et les animaux avaient déserté les Barren Grounds. Les Indiens (Chipewyan) qui devaient guider l'expédition se découragèrent rapidement et faussèrent compagnie à l'explorateur, ne lui laissant d'autre alternative que de renoncer momentanément à son projet. En février 1770, il en tenta de nouveau...

• Contrastes nord-sud Iakoutsk, Russie Aucune ville d'une envergure comparable ne connaît un hiver plus glacial que Iakoutsk, en Sibérie orientale : en janvier, la température moyenne y atteint en effet -41 °C.

• Océan Glacial Arctique Mer de Barents ISLANDE Mer Blan che FINLANDE SUEDE RUSSIE NORVEGE Océan Atlantique Volga ESTONIE Mer du Nord ROYAUME-UNI IRLANDE Oural LETTONIE Mer Baltique Dvi na LITUANIE Niémen RUSSIE KAZAKHSTAN Elb e Tam i se a SLOVAQUIE Dnie Don pr estr TAN Dni REP. TCHEQUE Danu UKRAINE KIS be Vol g SBE Meuse e in Se Loire Lux OU BELGIQUE BIELORUSSIE ule POLOGNE Od er er Wes NE AG EM ALL Rhin Manche Vis t Mer d'Azov ME NI

• Oregon - geography.

  B Rivers and Lakes The Columbia River forms most of the Oregon-Washington boundary, and with its tributaries this great river drains a large portion of Oregon. From the point where theColumbia first touches the state, at Wallula Gap, the river runs in a shallow gorge, deepening as it approaches the Cascades. This part of the river once had manyrapids and falls, but is now navigable by large vessels because of dams and locks that have been built along much of its length. An important tributary o...

• Oregon - USA History.

  B Rivers and Lakes The Columbia River forms most of the Oregon-Washington boundary, and with its tributaries this great river drains a large portion of Oregon. From the point where theColumbia first touches the state, at Wallula Gap, the river runs in a shallow gorge, deepening as it approaches the Cascades. This part of the river once had manyrapids and falls, but is now navigable by large vessels because of dams and locks that have been built along much of its length. An important tributary o...

• Earth (planet).

  Milky Way to complete one revolution around the Galaxy’s center. Earth’s axis of rotation is inclined (tilted) 23.5° relative to its plane of revolution around the Sun. This inclination of the axis creates the seasons and causes the height of the Sun in the sky at noon to increase and decrease as the seasons change. The Northern Hemisphere receives the most energy from the Sun when it is tiltedtoward the Sun. This orientation corresponds to summer in the Northern Hemisphere and winter in the S...

• Earth (planet) - astronomy.

  Milky Way to complete one revolution around the Galaxy’s center. Earth’s axis of rotation is inclined (tilted) 23.5° relative to its plane of revolution around the Sun. This inclination of the axis creates the seasons and causes the height of the Sun in the sky at noon to increase and decrease as the seasons change. The Northern Hemisphere receives the most energy from the Sun when it is tiltedtoward the Sun. This orientation corresponds to summer in the Northern Hemisphere and winter in the S...

• Définition: BORÉAL, -ALE, -ALS, -AUX, adjectif.

  n?gatif. ? Vieux. Fluide bor?al. Fluide auquel fut attribu? le pouvoir d'orienter les objets aimant?s en direction du nord. B.? Qui se trouve ? proximit? du P?le Nord; qui est relatif ? l'extr?me nord de la plan?te. Antonyme?: antarctique. Zone bor?ale; vents* bor?aux; contr?es, mers, r?gions bor?ales?: ? 4. ? ? Selon vous, je ressemble aux pays bor?als, ? J'ai six mois de clart?s et six mois de t?n?bres? PHILIPPE AUGUSTE MATHIAS DE VILLIERS DE L'ISLE-ADAM, Contes cruels, Conte d'amour,...

• El tiempo geológico.

  DESPUÉS DE LOS DINOSAURIOS La era cenozoica comenzó hace unos 65 millones de años y llega hasta nuestros días. Numerosos tipos de mamíferos aparecieron durante esta era. Con el paso del tiempo, fueron surgiendo especies de mayor tamaño. Sin embargo, algunos de los mamíferos y avesque vivían hace unos 55 millones de años eran muy distintos de los actuales. Había una especie de loros gigantescos incapaces devolar, ¡tan altos como tú! Los geólogos dividen la era cenozoica en dos periodos, llamados...

• El tiempo geológico - (exposé gratuit en espagnol).

  DESPUÉS DE LOS DINOSAURIOS La era cenozoica comenzó hace unos 65 millones de años y llega hasta nuestros días. Numerosos tipos de mamíferos aparecieron durante esta era. Con el paso del tiempo, fueron surgiendo especies de mayor tamaño. Sin embargo, algunos de los mamíferos y avesque vivían hace unos 55 millones de años eran muy distintos de los actuales. Había una especie de loros gigantescos incapaces devolar, ¡tan altos como tú! Los geólogos dividen la era cenozoica en dos periodos, llamados...

• Massachusetts - geography.

  mi). Other large artificial lakes include Wachusett Reservoir, East Brimfield Reservoir, and Cobble Mountain Reservoir. Assawompsett Pond, covering about 10 sq km(about 4 sq mi), is the largest natural lake. North Watuppa Pond and Long Pond are other large natural lakes. Lake Chaubunagungamaug, near Webster, is usuallycalled Webster Lake, because the Algonquian name is difficult to pronounce and spell. The full version of the Native American name is said to be the longest place-namein North Amer...

• Dans d'autres endroits enfin, les guerres de Louis XIV ont beaucoup contribué à cimenter une identité commune, sur une base à laquelle nous ne pensons pas souvent non plus : la haine de la barbarie française.

  retour desFrançais dépassetoutcequ’on peutimaginer, alors,enépouvante : laterre estbrûlée, lesvilles etles villages sontdétruits méthodiquement, leshabitants quin’ont pasfuietosent protester sontmutilés ou froidement assassinés.Laville d’Heidelberg garderalongtemps quelquesruinesintactes pourmontrer aumonde de quoi laFrance étaitcapable. Durantdesdécennies, nousditSeignobos, danslePalatinat même,parhaine, on continuera àdonner auxchiens lesnoms desmaréchaux coupablesdeces exactions. Lecontinent...

• océan (géographie) 1 PRÉSENTATION océan (géographie), vaste étendue d'eau salée qui occupe un bassin profond entre deux continents.

  météorologique), entre 27 et 28 °C ; elles décroissent de part et d’autre en direction des pôles, mais il existe des anomalies liées aux courants marins. Autour del’Antarctique et au centre de l’océan Glacial Arctique, les eaux de surface ont une température inférieure à - 1 °C toute l’année, dès le 75 e parallèle ; la mer y est gelée en permanence ; la banquise (ou pack ) s’étend encore plus en hiver mais on observe actuellement sa fonte et une diminution de son extension que l’on attribue au...

• Estados Unidos de América - geografía.

  los Grandes Lagos incrementan este tipo de precipitaciones. En enero, se da un tiempo de intenso frío y escasa caída de nieve, a causa de que las masas de aire delAtlántico no pueden penetrar muy al norte en pleno invierno. Finalmente, las ocasionales tormentas en la kona (costa oeste) de Hawai durante el invierno son consecuencia de la entrada de masas de aire procedentes del norte del Pacífico que aprovechan el desplazamiento de la corriente en chorro hacia el sur. El régimen de lluvias habi...

• Nova Scotia - Geography.

  summer. Nova Scotia receives an average of more than 1,140 mm (45 in) of rain annually, with the Atlantic shore receiving 1,400 mm (55 in) or more. Most of the provincereceives about 1,900 mm (about 70 in) of snow, and considerable winter precipitation comes in the form of rain or ice storms. The average temperature in January, thecoldest month, is generally about -4°C (about 25°F) near the coast and somewhat colder toward the interior. The average temperature in July, the hottest month, isabout...

• Nova Scotia - Canadian History.

  summer. Nova Scotia receives an average of more than 1,140 mm (45 in) of rain annually, with the Atlantic shore receiving 1,400 mm (55 in) or more. Most of the provincereceives about 1,900 mm (about 70 in) of snow, and considerable winter precipitation comes in the form of rain or ice storms. The average temperature in January, thecoldest month, is generally about -4°C (about 25°F) near the coast and somewhat colder toward the interior. The average temperature in July, the hottest month, isabout...

• Federal Republic of Germany - country.

  B Rivers and Lakes Rivers have played a major role in Germany’s economic development. The Rhine River flows in a northwesterly direction from Switzerland through much of westernGermany and The Netherlands into the North Sea. It is a major European waterway and a pillar of commerce and trade. Its primary German tributaries include theMain, Mosel, Neckar, and Ruhr rivers. The Oder (Odra) River, along the border between Poland and Germany, runs northward and empties into the Baltic; it provides an...