23 résultats pour "yellowstone"

• Yellowstone.

• Yellowstone National Park Trip Planner

  1 Explore Yellowstone safely You must stay on boardwalks and designated trails around hydrothermal features. Delicate formations and crust surrounding them is thin and breaks easily, and often overlies scalding water. Visitors have died in them. • To x i c gases exist at dangerous levels in some areas. If you feel sick, leave immediately. • Pets are prohibited in hydrothermal areas. • Swimming is prohibited where water f lows entirely from a hydrothermal spring or pool. Wher...

• Yellowstone - geographie.

• Yellowstone National Park.

• Yellowstone National Park - geography.

• Yellowstone National Park - geography.

  1976 and a World Heritage Site in 1978 by the United Nations Educational, Scientific and Cultural Organization (UNESCO). Administered by the National Park Service.Area, 898,317 hectares (2,219,791 acres). Microsoft ® Encarta ® 2009. © 1993-2008 Microsoft Corporation. All rights reserved.

• Yellowstone meaning “yellow stone

• Yellowstone (« Pierre jaune », en anglais), grand parc national des États-Unis, créé en 1872 sur 8 500 km 2, situé dans l'État du Wyoming.

• Wyoming (state) - geography.

  The basins, which lie in the rain shadow of mountains, are very dry, with an average annual precipitation of about 250 mm (about 10 in) or less; the Great Plains regionhas an annual average of about 380 mm (about 15 in), and the Black Hills region receives slightly more. Thunderstorms and hailstorms are relatively frequent insummer. The annual snowfall ranges from about 500 mm (about 20 in) in the Bighorn Basin to well over 5,100 mm (over 200 in) in the higher mountains, where annualprecipitatio...

• Wyoming (state) - USA History.

  The basins, which lie in the rain shadow of mountains, are very dry, with an average annual precipitation of about 250 mm (about 10 in) or less; the Great Plains regionhas an annual average of about 380 mm (about 15 in), and the Black Hills region receives slightly more. Thunderstorms and hailstorms are relatively frequent insummer. The annual snowfall ranges from about 500 mm (about 20 in) in the Bighorn Basin to well over 5,100 mm (over 200 in) in the higher mountains, where annualprecipitatio...

• Jackson (William Henry), Yellowstone - photographie.

• Parques nacionales y reservas naturales - geografía.

  vertiente meridional del parque está moteada de taiga (una formación boscosa de arbustos de hoja perenne), mientras que en el norte sólo se encuentra la rala vegetaciónde la tundra ártica. Por el parque deambulan enormes rebaños de caribúes. En África, el Parque nacional Serengeti (Tanzania), de 14.763 km 2, y la colindante Reserva nacional Masai Mara (Kenia), de 1.510 km 2, fueron creados para proteger a las manadas de elefantes, gacelas, impalas y cebras existentes en los mismos. Las praderas...

• Montana - geography.

  (191 sq mi), is Montana’s largest lake, and the largest natural freshwater lake in the contiguous states west of the Mississippi River. C Climate Climatic regions in Montana coincide roughly with the two major physiographic regions. In western Montana, as compared with the eastern plains area, winters tend tobe milder while summers are cooler. Precipitation is more evenly distributed throughout the year in the west, and it is cloudier and somewhat more humid in all seasons.In addition, the grow...

• Montana - USA History.

  (191 sq mi), is Montana’s largest lake, and the largest natural freshwater lake in the contiguous states west of the Mississippi River. C Climate Climatic regions in Montana coincide roughly with the two major physiographic regions. In western Montana, as compared with the eastern plains area, winters tend tobe milder while summers are cooler. Precipitation is more evenly distributed throughout the year in the west, and it is cloudier and somewhat more humid in all seasons.In addition, the grow...

• L'énergie du coeur de la Terre Source chaude du Grand Prismatic dans le parc national de Yellowstone, États-Unis.

• Les parcs nationaux

  fougères arborescentes de 15 rn de hauteur et une centaine d'espèces d'orchidées. Si la faune est peu diverse, 11 espèces de chauves-souris sont recensées, et la forêt abrite l'un des plus gros insectes du monde, le dynaste Hercule, long de 18 cm, et le «tapeur», un pic noir endémique. AUTRES PARCS D'EUROPE Près de 200 parcs nationaux s'étendent en Europe, avec quelques belles réussites du point de vue de la protection de la faune : le lynx cont...

• Rocheuses (montagnes).

  partie centrale, comme en Idaho et au Montana, mais elle n'a qu'une importance locale : il faut préciser que bon nombre d'espaces boisés sont difficiles d'accès ou sont protégés dans le cadre de la législation sur les parcs nationaux. Les ressources du sous-sol des Rocheuses sont nombreuses, mais très médiocrement exploitées, en raison de l'éloignement des grandes régions industrielles. L'extraction de minerais de métaux non ferreux fait vivre un certain nombre de petites villes : Leadville...

• 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...

• Lewis and Clark Expedition.

  took a small detachment into present-day north central Montana, thinking that the course of the Marias River might provide an American claim to fur-rich country inwhat is now the Canadian province of Alberta. In August the groups reunited on the Missouri River, near the mouth of the Yellowstone. They arrived in St. Louis onSeptember 23, 1806. C Relations with the Native Americans and Spanish The Lewis and Clark Expedition made a journey through the homelands of native people. What American expl...

• Lewis and Clark Expedition - explorer.

  took a small detachment into present-day north central Montana, thinking that the course of the Marias River might provide an American claim to fur-rich country inwhat is now the Canadian province of Alberta. In August the groups reunited on the Missouri River, near the mouth of the Yellowstone. They arrived in St. Louis onSeptember 23, 1806. C Relations with the Native Americans and Spanish The Lewis and Clark Expedition made a journey through the homelands of native people. What American expl...

• Volcano.

  before eruption. Very violent explosive eruptions are called Plinian eruptions, after Roman naturalist Pliny the Elder. These eruptions can last for several hours to daysand eject a large amount of pyroclastic material. Some volcanoes can produce much more energetic eruptions that eject materials farther from the vents because oftheir andesitic and dacitic composition. Andesitic and dacitic lava is generally thicker than basaltic lava. Stiff lava generally produces more-explosive eruptions. B No...

• Idaho - geography.

  Idaho-Montana state line in the southern part of the Bitterroot Mountains. Consequently, nearly all the rivers in the state drain toward the Pacific. Most of Idaho lieswithin the drainage basin of the Columbia River system. The Snake River, which is the chief river in southern and central Idaho, follows a crescent-shaped course forabout 790 km (about 490 mi) across southern Idaho. It then swings northward along the Idaho state line and joins the Columbia River in Washington. Major tributariesof...

• Idaho - USA History.

  Idaho-Montana state line in the southern part of the Bitterroot Mountains. Consequently, nearly all the rivers in the state drain toward the Pacific. Most of Idaho lieswithin the drainage basin of the Columbia River system. The Snake River, which is the chief river in southern and central Idaho, follows a crescent-shaped course forabout 790 km (about 490 mi) across southern Idaho. It then swings northward along the Idaho state line and joins the Columbia River in Washington. Major tributariesof...