234 résultats pour "vegetation"

• Syria - country.

  D Education Primary education is free and compulsory for all children aged 6 through 12. Some 78 percent of the adult Syrian population was estimated to be literate in 2005.Primary schools enrolled 2.8 million pupils in the 2000 school year, and 1.1 million students attended secondary schools and vocational institutes. In 1998, 94,110 Syrian students were enrolled in institutes of higher education. Syria has universities in Damascus, Ḩalab, Ḩim ş, and Al L ādhiq īyah. Also in Damascus isthe Ar...

• British Columbia - Geography.

  hemlock, Douglas fir, Sitka spruce, and various cedars, grows rapidly in the mild, wet climate and produces the largest trees in Canada. In the dry lowlands of thesouthern and central interior, ponderosa and lodgepole pines, aspen, and bunchgrass are characteristic. Spruce dominates the Prince George region. Prairie grasses andstands of aspen are found in the northeastern corner of the province. At elevations higher than about 1,800 m (about 6,000 ft), an alpine vegetation of shrubs, mosses,and...

• British Columbia - Canadian History.

  hemlock, Douglas fir, Sitka spruce, and various cedars, grows rapidly in the mild, wet climate and produces the largest trees in Canada. In the dry lowlands of thesouthern and central interior, ponderosa and lodgepole pines, aspen, and bunchgrass are characteristic. Spruce dominates the Prince George region. Prairie grasses andstands of aspen are found in the northeastern corner of the province. At elevations higher than about 1,800 m (about 6,000 ft), an alpine vegetation of shrubs, mosses,and...

• Saskatchewan (province) - Geography.

  The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...

• Saskatchewan (province) - Canadian History.

  The length of the frost-free season varies within the province. In the southwest, particularly in the valley lands along the South Saskatchewan River, the frost-freeperiod ranges from 150 to 160 days. Regina enjoys about 123 frost-free days, and Saskatoon has about 111. The far north has only from 85 to 95 frost-free days. One important characteristic of Saskatchewan’s climate is the great variability in temperature and precipitation from year to year, which is often critical for agriculture.The...

• Sweden - country.

  mi) and is Sweden’s second largest lake, after Vänern. The two lakes, together with several smaller lakes, rivers, and canals, form an internal water route called theGöta Canal. Built in the early 19th century, the Göta Canal extends for about 386 km (about 240 mi) and provides a scenic transportation link between the Baltic Sea,at Stockholm, and the Kattegat. Sweden’s other large lakes in the district include Mälaren, Hjälmaren, and the famously picturesque Siljan. D Climate Although one-seven...

• China - geographie.

  sind nährstoffreich und werden landwirtschaftlich genutzt. Das breite Flussdelta des Xi Jiang wird auch Kantondelta genannt. 2.1. 6 Die Tibetische Hochebene Im abgelegenen äußersten Südwesten Chinas liegt die Tibetische Hochebene. Das zerklüftete Bergland gehört zu den höchstgelegenen Plateauregionen der Welt. Diedurchschnittliche Höhe beträgt 4 510 Meter. Die Hochebene wird von Hochgebirgen begrenzt; dies sind im Süden Himalaya, im Westen Pamir und Karakorum und im NordenKunlun Shan und Qilian...

• Hawaii (state) - geography.

  limestone along the coast. The volcanoes of the Hawaiian Islands are all so-called shield volcanoes, or lava domes. Unlike the volcanoes of Alaska and South America, those of Hawaii were notcreated by very explosive eruptions. Formed mostly by lava flows, they are great rounded mountain masses, rather than steep-sided cones. Mauna Kea, dormant forcenturies, is the highest mountain in the state. It rises to 4,205 m (13,796 ft) above sea level, and its summit is dotted with cinder cones formed by...

• Hawaii (state) - USA History.

  limestone along the coast. The volcanoes of the Hawaiian Islands are all so-called shield volcanoes, or lava domes. Unlike the volcanoes of Alaska and South America, those of Hawaii were notcreated by very explosive eruptions. Formed mostly by lava flows, they are great rounded mountain masses, rather than steep-sided cones. Mauna Kea, dormant forcenturies, is the highest mountain in the state. It rises to 4,205 m (13,796 ft) above sea level, and its summit is dotted with cinder cones formed by...

• Chine.

  la partie nord du plateau de l’Ordos, ils sont recouverts d’un fin limon d’origine éolienne, le lœss. Peu compact, le lœss, épais de 200 m, est très sensible à l’érosion(ravinement), la surface des plateaux étant incisée par de nombreux ravins aux parois verticales. Débordant sur le Xinjiang, la Mongolie-Intérieure et le Gansu, le désert de Gobi est un désert de sable et de pierres de type continental. Il s’étend sur le plateau Mongol,situé entre 800 et 1 200 m d’altitude. La végétation devient...

• Canada.

  Six general landform regions are distinguishable in Canada: the Appalachian Region, the Great Lakes and St. Lawrence Lowlands, the Canadian Shield, the Great Plains,the Canadian Cordillera, and the Canadian Arctic Archipelago. B1 Appalachian Region and Great Lakes and St. Lawrence Lowlands Eastern Canada consists of the Appalachian Region and the Great Lakes and St. Lawrence Lowlands. The Appalachian Region embraces Newfoundland Island, NovaScotia, New Brunswick, Prince Edward Island, and the G...

• Canada - country.

  Six general landform regions are distinguishable in Canada: the Appalachian Region, the Great Lakes and St. Lawrence Lowlands, the Canadian Shield, the Great Plains,the Canadian Cordillera, and the Canadian Arctic Archipelago. B1 Appalachian Region and Great Lakes and St. Lawrence Lowlands Eastern Canada consists of the Appalachian Region and the Great Lakes and St. Lawrence Lowlands. The Appalachian Region embraces Newfoundland Island, NovaScotia, New Brunswick, Prince Edward Island, and the G...

• Canada - Canadian History.

  Six general landform regions are distinguishable in Canada: the Appalachian Region, the Great Lakes and St. Lawrence Lowlands, the Canadian Shield, the Great Plains,the Canadian Cordillera, and the Canadian Arctic Archipelago. B1 Appalachian Region and Great Lakes and St. Lawrence Lowlands Eastern Canada consists of the Appalachian Region and the Great Lakes and St. Lawrence Lowlands. The Appalachian Region embraces Newfoundland Island, NovaScotia, New Brunswick, Prince Edward Island, and the G...

• Native Americans of Middle and South America.

  A line that snakes across central Mexico near the Tropic of Cancer forms the northern boundary of Mesoamerica; north of this line rainfall sharply declines and theclimate is much drier. The ancient civilizations of Mesoamerica all arose and developed in the area between this line and the Guatemalan highlands far to the south. Richvolcanic soils are found throughout much of the region. A2 People and Languages Mesoamerica was a great melting pot, home to many peoples and interrelated cultures. In...

• Algeria - country.

  areas to fishing. National parks, including the giant Tassili N’Ajjer National Park in the eastern corner of the country, comprise a large proportion of the protected area. The effects of Algeria’s human population on the fragile landscape have been severe. The greatest ecological threats are deforestation and burning of scrub vegetation,conversion of steppe habitat to arable land, and soil erosion due to overgrazing and poor farming practices. Pollution of Mediterranean coastal waters is pervas...

• docteur docteur j m c M A U P P I

  il contourne la face latérale de la carotide interne tandis que le X est plus en dehors  dans l’angle dièdre jugulo-carotidien,  que le gang lion sympathique supérieur est accolé  à sa face postérieure de la carotide et que le XII  plus postérieur les cravate tous les 3 en  arrière Le X I quand à lui très voisin du X s’écart e d’eux de plus en plus et croise la  jugulaire interne tantôt par l’arrière tantôt par l ’avant              4 portion horizontale laréro 4 portion horizontale laréro 4 por...

• docteur docteur j m c M A U P P I

  il contourne la face latérale de la carotide interne tandis que le X est plus en dehors  dans l’angle dièdre jugulo-carotidien,  que le gang lion sympathique supérieur est accolé  à sa face postérieure de la carotide et que le XII  plus postérieur les cravate tous les 3 en  arrière Le X I quand à lui très voisin du X s’écart e d’eux de plus en plus et croise la  jugulaire interne tantôt par l’arrière tantôt par l ’avant              4 portion horizontale laréro 4 portion horizontale laréro 4 por...

• IX nerf glosso-pharyngien ( nerf de la langue, du pharynx et de la parotide )

  il contourne la face latérale de la carotide interne tandis que le X est plus en dehors  dans l’angle dièdre jugulo-carotidien,  que le gang lion sympathique supérieur est accolé  à sa face postérieure de la carotide et que le XII  plus postérieur les cravate tous les 3 en  arrière Le X I quand à lui très voisin du X s’écart e d’eux de plus en plus et croise la  jugulaire interne tantôt par l’arrière tantôt par l ’avant              4 portion horizontale laréro 4 portion horizontale laréro 4 por...

• I X nerf glosso-pharyngien ( nerf de la langue, du pharynx et de la parotide )

  il contourne la face latérale de la carotide interne tandis que le X est plus en dehors dans  l’angle dièdre jugulo-carotidien,  que le ganglion  sympathique supérieur est accolé à sa face  postérieure de la carotide et que le XII plus posté rieur les cravate tous les 3 en arrière Le X I  quand à lui très voisin du X s’écarte d’eux de plus  en plus et croise la jugulaire interne tantôt  par l’arrière tantôt par l’avant              4 portion horizontale laréro 4 portion horizontale laréro 4 port...

• Gardening - biology.

  of synthetic and organic fertilizers, see Organic Farming.) Fertilizers usually are sold in packages, on which the percentage by weight of the macronutrients nitrogen (N), phosphorus (P), and potassium (K) are listed on thelabel—always in the order N-P-K. For example, a fertilizer that is labeled 10-5-3 is 10 percent nitrogen, 5 percent phosphorus, and 3 percent potassium. V PLANTING AND TRANSPLANTING Before planting seeds, gardeners prepare, or till, the soil using a variety of methods. Some...

• Fire - chemistry.

  were usually natural caves. Eventually people learned to dip branches in pitch to form torches. They created crude lamps by filling a hollowed out piece of stone withmoss soaked in oil or tallow (a substance derived from animal fat). By cooking with fire, prehistoric people made the meat of the animals they killed more palatable and digestible. They learned to preserve meat by smoking it over a fire,vastly decreasing the danger of periodic starvation. Cooking also enabled them to add some for...

• National Parks and Preserves.

  Some ibex raised in Italy’s 700 sq km (220 sq mi) Gran Paradiso National Park (1922) were transferred to aid herd restoration elsewhere in the country. Switzerlandreturned lynx to Swiss National Park to keep red deer populations in check. The growth of national parks also enabled many European countries to restore forests thathad given way to industrialization by the early 20th century. Africa’s wildlife was hunted heavily from the late 19th century well into the 20th century. By 1920 big-game h...

• Ethiopia - country.

  constitute about 6 percent of the population. The Somali, who live in the east and southeast, notably in the Ogadēn region, are about equal in number to the Shangalla.The Denakil inhabit the semidesert plains east of the highlands. The nonindigenous population includes Yemenis, Indians, Armenians, and Greeks. B Political Divisions Ethiopia is divided into nine regions composed of specific ethnic groups. The regions, which have a significant degree of autonomy, are Tigray; Afar; Amhara; Oromia;S...

• Chile - country.

  D Plant and Animal Life The indigenous plant life of Chile varies according to climatic zone. Plant life in the northern region includes brambles and cactus and has little variety. Here, theAtacama provides one of the best examples on Earth of an absolute desert. The more humid Central Valley supports several species of cacti, espino (a thorny shrub),grasses, and the Chilean pine, which bears edible nuts. Dense rain forests are located south of Valdivia with laurel, magnolia, false beech, and v...

• Maryland - geography.

  Maryland has no large natural lakes. The largest body of water is a reservoir, Deep Creek Lake, which has a surface area of only 18 sq km (7 sq mi). It lies on theAllegheny Plateau, behind a dam on a tributary of the Youghiogheny River. C Coastline The deeply indented shoreline has a length of 5,134 km (3,190 mi), of which only 50 km (31 miles) fronts on the Atlantic Ocean. The most significant coastal feature isChesapeake Bay. In the bay are many islands and Kent Island is the largest. The sta...

• Maryland - USA History.

  Maryland has no large natural lakes. The largest body of water is a reservoir, Deep Creek Lake, which has a surface area of only 18 sq km (7 sq mi). It lies on theAllegheny Plateau, behind a dam on a tributary of the Youghiogheny River. C Coastline The deeply indented shoreline has a length of 5,134 km (3,190 mi), of which only 50 km (31 miles) fronts on the Atlantic Ocean. The most significant coastal feature isChesapeake Bay. In the bay are many islands and Kent Island is the largest. The sta...

• Spain - country.

  B Natural Resources Spain has a number of mineral resources. The largest known deposits are of iron ore, zinc, and lead. Spain also produces significant quantities of copper and mercury.These deposits are mined mainly in Huelva province in southwestern Spain, around Cartagena on the Mediterranean, and at various points along the Bay of Biscay inthe north. Additionally, uranium is mined in the region of Extremadura, near the Portuguese frontier, where pyrites, fluorspar, gypsum, tungsten, and po...

• En quoi l'appareil végétatif de la plante semble être bien adapté à un mode de vie fixé ?

  2 Dans le schéma -ci-dessous nous vous proposons un schéma de l’organisation de la plante pour mieux localiser les différents éléments constitutifs de la plante. {L’organisation de l a plante ; l’appareil végétatif , présentez un schéma, titré et légendé} Après avoir vu les différents éléments qui constituent l’appareil végétatif de la plante nous allons maintenant nous pencher plus précisément sur les différentes surfaces d’échange de la plant...

• Regime

  Fourth Same as second Fifth Protein or tuna + vegetables Sixth Vegetables Seventh Mixed fruits Eighth

• angiospermes.

  Les organes de reproduction des angiospermes sont groupés en fleurs bisexuées. Ils sont plus compliqués que ceux des gymnospermes. Beaucoup de fleurs sont vivement colorées, odorantes, d'autres, discrètes. Ces fleurs sont isolées ou regroupées en inflorescence. Elles comportent des organes mâles (étamines) et des organes femelles (carpelles formant le pistil). Les étamines émettent le pollen que les carpelles porteurs d'ovules reçoivent. Une double fécondation caractérise les angiosp...

• Le Sahara et le Sahel (Travaux Personnels Encadrés – Géographie - Enseignements Pratiques Interdisciplinaires)

  LES TO U AREG • Les Touareg , dont la population est estimée à 1 million d 'individus, forment la principale communauté du Sahara . • Vêtus de tissus de couleur bleu indigo qui déteint sur la peau , ils furent aussi appelés les " hommes bleus , par les voyageurs occidentaux. • Eux-mêmes préfèrent se désigner sous les noms d'lmajaghan ou lmuhagh -" noble et libre , -ou de Kel Tamajaq- " les gens de Tamajaq "· • Leur langue est le tamajaq , tamasheq ou tamahaq...

• La cavité centrale

  Au sein du ventricule latéral les plexus choroïdes sont situés du côté de la concavité c'est-à-dire sur le plancher de la corne frontale , sur le toit de la corne temporale, il y a dans le carrefour une dilatation appelé le globus choroïdien mais il n'y a jamais de plexus qui s'enfoncent dans corne occipitale. Au niveau du V3 les plexus choroïde se placent au niveau de son toit , il n'y en aura pas dans l’aqueduc du mésencéphal et au niveau de V4 ils sont placés au niveau du toit. Ce liquide...

• les algues

  • En effet, l'agittdion de l'eau limite les variations de température, favorise le renouvellement de l'eau, agit sur la fixation des algues et le dépôt des sédiments. • De même, la durée de l'émersion lors des marées basses détermine la répartition des différentes espèces dans la zone de balancement des marées. Pour certaines algues, l'émersion périodique limite leur extension en profondeur. Certaines meurent dès qu'elles ont perdu 2 à 3% de leur...

• Les déserts

  CLIMATS , RELIEFS ET PAYSAGES L ES ŒMATS • 111\'y a pas de clim�ts désertiques, mais une dégradation des climats due à J'aridité des déserts. Les climats dits " désertiques » ont Je même régime saisonnier de pluies que reurs .voisins. • Le climat d'un désert dépend de son altitude. 1! fait !}lus chaud au niveau de la mer dans le Namib (Namibie) qu'à 2 ooo m dans Je Hoggar (Algérie). • Le clÎmat dépend aussi de sa latitude. Éloignés de l'équat...

• les mousses et leurs proches cousines les hépatiques (Exposé – SVT – Collège/Lycée)

  gamétophytes. Les petites poivrières qui se dressent sur les mousses à certaines périodes de l'année con­ tiennent les spores qui seront répan­ dues dans l'atmosphère quand elles seront mûres, transportées par le vent et parfois par les eaux de ruissellement. Elles iront germer un peu plus loin, voire très loin si le vent les emporte à haute altitude, gage de la pérennité de l'espèce. Si les spores, à n chromosomes, sont produites sans fécondation ,...

• Le désert exerce une étrange attirance.

  de formes d'accumulation (cônes de déjection, terrasses caillouteuses ou limoneuses). Le travail du froid explique, d'autre part, la présence de coulées de blocs ou de cirques glaciaires ; celui du vent, l'existence de vieilles dunes roses et de dépressions fermées. Tous ces modelés sont des héritages des périodes glaciaires et interglaciaires du quaternaire, fidèlement illustrées d'ailleurs par les poissons, les girafes ou les hippopotames gravés sur les rochers par les hommes préhistoriques. S...

• Afrique du Sud.

  Drakensberg Steve Vidler/eStock Photo Dans cette même région du Cap, les chaînes montagneuses du Swartberg et du Langeberg s’intercalent entre les Karroo et le Grand Escarpement. Sur la côte méridionale,juste au sud du Cap, se trouve un promontoire isolé, la montagne de la Table (1 086 m d’altitude). À proximité, le cap de Bonne-Espérance, autrefois îlot rocheux,maintenant rattaché au continent, s’élève à 256 m. Ce cap n’est pas très éloigné du cap des Aiguilles qui représente le point le plus m...

• Afrique du Sud.

  l’est du Cap. Drakensberg Steve Vidler/eStock Photo Dans cette même région du Cap, les chaînes montagneuses du Swartberg et du Langeberg s’intercalent entre les Karroo et le Grand Escarpement. Sur la côteméridionale, juste au sud du Cap, se trouve un promontoire isolé, la montagne de la Table (1 086 m d’altitude). À proximité, le cap de Bonne-Espérance, autrefoisîlot rocheux, maintenant rattaché au continent, s’élève à 256 m. Ce cap n’est pas très éloigné du cap des Aiguilles qui représente le p...

• Composante essentielle de notre patrimoine naturel, la forêt occupe 32 % des terres émergées de la planète.

  conifères feuillu formation végétale fougère futaie maquis - 1.GÉOGRAPHIE La faune. De nombreuses espèces animales colonisent les forêts ; on peut en dénombrer jusqu'à 7 000 dans une forêt de chênes. Tous les grands prédateurs ayant été éradiqués des forêts françaises, les plus grands animaux aujourd'hui sont les cervidés (cerf, daim, chevreuil) et les sangliers. Des opérations de réintroduction de prédateurs, comme celle du lynx dans les Vosges, tentent de reconstituer l'équilibre écolog...

• Himalayas - geography.

  result of deforestation the habitat of most of the wildlife has been destroyed. They are now restricted to special protected areas such as the Jaldapara and Kazirangasanctuaries in India ( see Kaziranga National Park) and the Chitawan preserve in Nepal. There are few animals in the Middle Himalayas because of extensive deforestation. In the Great Himalayas musk deer, wild goats, sheep, wolves, and snow leopards are found. The existence of the Abominable Snowman or Yeti has beenreported by highla...

• Angola (country) - country.

  Portugal in 1975, it had approximately 400,000 Portuguese settlers. The vast majority of the Portuguese community has since departed for Portugal. A Population Characteristics The 2008 estimated population of Angola, including Cabinda, was 12,531,357. The population distribution, however, was uneven, with about 70 percent of thepopulation concentrated in the north and along the coast. The rate of population increase was 2.1 percent annually in 2008. The population is overwhelmingly rural; only3...

• Elephant - biology.

  B Trunk An elephant's nose and upper lip are combined in a long, limber trunk, an exceptionally supple appendage with an estimated 150,000 muscles. The versatile trunk actslike a hand for grasping low-growing shrubs and other food and placing it into the mouth; an arm for breaking off tree branches; or a snorkel for breathing when theelephant's body is submerged. Elephants also use their trunks to suck up water and squirt it into their mouths for drinking or over their bodies for bathing. Nostr...

• Rain Forest.

  dropped into the heart of the forest by helicopters. Suspended from the crane’s long, movable arm is a large gondola that functions as a mobile treetop laboratory.Moving from tree to tree, forest researchers collect specimens, conduct experiments, and observe life in the canopy frontier. The highest stratum of the rain forest is made up of the emergent trees, those individuals that stick up above the forest canopy. Emergents, which do not form acontinuous layer, are usually the giants of the for...

• Yemen - country.

  port. Al Ḩudaydah (155,110), in the Tih āmah, is the second largest port. Ta‘izz, (178,043), in the highlands above Aden, is an important commercial and light industrialcenter. Among Yemen’s larger towns are Şa‘dah, far to the north; Dham ār, Yarim, and Ibb, in the middle region; Al Mukall ā, on the southern coast; and in Hadhramaut,the towns of Shib ām, Say‘ ūn, and Tar īm. C Language Nearly all Yemenis speak Arabic. However, the country’s extremely rugged terrain, widely separated population...

• Alberta - Geography.

  C Climate Except for the mountain areas, summers throughout the province are quite warm. Winters are long and extremely cold. In July, average daily temperatures range fromabout 16°C (about 60°F) along the northern boundary to about 21°C (about 70°F) in the south. In the extreme southeastern section of the province, temperatures of43°C (110°F) have been recorded. In January, average daily temperatures range from about -14°C (about 6°F) at Grande Prairie to about -9°C (about 16°F) atCalgary. Tem...

• Alberta - Canadian History.

  C Climate Except for the mountain areas, summers throughout the province are quite warm. Winters are long and extremely cold. In July, average daily temperatures range fromabout 16°C (about 60°F) along the northern boundary to about 21°C (about 70°F) in the south. In the extreme southeastern section of the province, temperatures of43°C (110°F) have been recorded. In January, average daily temperatures range from about -14°C (about 6°F) at Grande Prairie to about -9°C (about 16°F) atCalgary. Tem...

• Saudi Arabia - country.

  C Natural Resources Some of the world’s largest oil and natural gas fields lie beneath Saudi Arabia and its offshore waters, representing the country’s most economically important naturalresource. In 2007 Saudi Arabia’s oil reserves were estimated at 264 billion barrels. Before the discovery and exploitation of these reserves in the mid-20th century,Saudi Arabia was one of the poorest countries in the world. Its relatively small population subsisted in a harsh environment with little agricultur...

• Puerto Rico - geography.

  the length of the day remains fairly constant throughout the year. San Juan has a mean July temperature of 28°C (83°F) and a mean January temperature of 25°C (77°F). The average temperature of the seawater surrounding theisland is 27°C (81°F), with little variation during the course of the year. The entire island is cooled by the trade winds from the northeast. This air also contains much water vapor. As the air is forced to rise over the mountains, it becomescooler and the water vapor condenses...

• France - country.

  In both the Paris and Aquitaine basins, fertile soils derived from limestone and wind-deposited dust, called loess, have supported prosperous agriculture since ancienttimes. Other lowlands in France are scattered and relatively small. They include the Alsace Plain in the east, bordering Germany, the valley of the Rhône River in thesoutheast, and the Languedoc Plain along the Mediterranean coast. A2 Uplands France contains several regions of uplands, the worn down remains of ancient mountain sys...

• Analyse d'une oeuvre de Gustave Courbet; La Source.

  La femme occupe en effet une place centrale dans l'oeuvre, sa peau lumineuse contraste avec la végétation sombre qui l'entoure. Cependant, l'eau à ses pieds est cristalline et claire, à l'instar de se peau. Elle est représentée entièrement nue, sans aucun apparat, et de dos. Son corps est très détaillé, on y voit les plis et creux de la chair dodue de ses jambes, de ses fesses et de ses hanches qui montent très haut sur la taille. Quant à la partie haute de son corps, comprenant le dos, le buste...