226 résultats pour "300"
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séisme.
Fonctionnement d'un sismographeLe sismographe présenté ici permet de détecter et d'enregistrer les mouvements d'ondes verticales. Lorsqu'une onde sismique atteintle sismographe, le sol, le cadre et le tambour rotatif vibrent en oscillant verticalement, alors que la masse suspendue par le ressortreste immobile du fait de son inertie. Le stylet relié à la masse trace ainsi une ligne brisée sur le tambour.© Microsoft Corporation. Tous droits réservés. De tout temps, les questions relatives à la nat...
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Bridge
1
EINLEITUNG
Bridge, Kartenspiel für vier Personen, das mit 52 französischen Karten gespielt wird.
Strafpunkte für Unterstiche werden der Gegenspielerseite als Pluspunkte angerechnet, wobei es bei Nichtgefahr 50 Punkte pro Stich und bei Gefahr 100 Punkte pro Stichgibt. Kontragebote verdoppeln den Wert des ersten Unterstichs und steigern nachfolgende Unterstiche bis auf 200 Punkte bei Nichtgefahr für die ersten drei Stiche und300 Punkte für Nichtgefahr sowie 300 Punkte bei Gefahr. Die Minuspunkte für ein Rekontra zählen vierfach. 4 DOPPEL-BRIDGE Doppel-Bridge ist eine Variante des Kontrakt-Br...
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Microprocessor.
thin layer of oxide about 75 angstroms deep (an angstrom is one ten-billionth of a meter). Nearly every layer that is deposited on the wafer must be patterned accurately into the shape of the transistors and other electronic elements. Usually this is done in aprocess known as photolithography, which is analogous to transforming the wafer into a piece of photographic film and projecting a picture of the circuit on it. A coatingon the surface of the wafer, called the photoresist or resist, changes...
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amas et superamas - astronomie.
Outre leur intérêt comme test de l’évolution stellaire, les amas ouverts d’étoiles servent également d’étalon de distance. En effet, les observations photométriques de lapopulation stellaire des amas ouverts confrontées à la modélisation permettent d’attribuer une distance fiable à l’amas ouvert, qui sert alors de référence pour évaluer ladistance d’étoiles isolées plus lointaines. Ainsi, l’amas des Hyades, situé à environ 135 000 années-lumière de la Terre, joue à cet égard un rôle crucial. Les...
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amas et superamas - astronomie.
Outre leur intérêt comme test de l’évolution stellaire, les amas ouverts d’étoiles servent également d’étalon de distance. En effet, les observations photométriques de lapopulation stellaire des amas ouverts confrontées à la modélisation permettent d’attribuer une distance fiable à l’amas ouvert, qui sert alors de référence pour évaluer ladistance d’étoiles isolées plus lointaines. Ainsi, l’amas des Hyades, situé à environ 135 000 années-lumière de la Terre, joue à cet égard un rôle crucial. Les...
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Burundi - geographie.
5.4 Politik Die wichtigsten Parteien sind die Hutu-Parteien Front pour la Démocratie au Burundi (FRODEBU) und die aus der gleichnamigen Rebellenorganisation hervorgegangene Forces pour la Défense de la Démocratie (FDD) sowie die Tutsi-Partei Unité pour le Progrès National (UPRONA). 5.5 Verteidigung Die Streitkräfte der Republik Burundi umfassen ein Heer aus 45 000 Berufssoldaten und eine Luftwaffe mit 200 Soldaten. Die Gendarmerie besteht aus 5 300 Mann. 6 WIRTSCHAFT Burundi ist eines d...
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Turkmenistan - geographie.
4.2 Kunst und Kunsthandwerk Wie in den Nomadenkulturen Mittel- und Zentralasiens allgemein üblich, ist die Handwerkskunst mit ihrer Gestaltung von Alltagsgegenständen hoch entwickelt. Dabei stehtin Turkmenistan das Knüpfen von Teppichen mit ihrer hochdifferenzierten Ornamentik künstlerisch im Mittelpunkt. Archäologisch lässt sich die Teppichherstellung seit dem6. Jahrhundert v. Chr. nachweisen. Teppiche werden heute auch industriell hergestellt. Die 15 Teppichfabriken des Landes beschäftigen 10...
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Russie.
(18 390 km²), et le lac Onega (9 610 km²), tous deux d’origine glaciaire, situés au nord-ouest de la Russie d’Europe et dont le principal émissaire, la Neva, rejoint le golfede Finlande. 2.3 Climat Le territoire de la Russie est soumis, dans sa plus grande partie, à un climat continental rigoureux, avec des hivers longs et froids, des étés chauds mais courts, et dessaisons intermédiaires réduites. La majeure partie du pays connaît plus de cent vingt jours de gel par an. Plusieurs facteurs inter...
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LA SECONDE GUERRE MONDIALE
- les populations germanophones jouissent de tous leurs droits ; - les Latins sont subordonnes mais respectes ; - les Slaves sont exploites et massacres ; - lee Juifs et les Tsiganes, qualifies de « sous-hommes », sont persecutes, &pones dans des camps de concentration, puis, a partir de 1942, extermines en masse dans des chambres a gaz : c'est la « solution finale » planifiee par l'executif nazi a la conference de Wannsee (janvier 1942). L'OFFENSIVE DE L'AXE(HIVER 1941/1942 -ETE 1942) DANS LATL...
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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...
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Afrique.
delta. Le Congo, avec ses 4 400 km, baigne une grande partie de l'Afrique centrale. Il naît en Zambie et coule vers le nord sous le nom de Lualaba. Il oblique vers l'ouest puis versle sud-ouest pour se jeter dans l'océan Atlantique. Le troisième grand fleuve africain, le Niger, en Afrique occidentale, est long d'environ 4 200 km ; son cours supérieur n'est navigable que pendant la saison des pluies. LeNiger, qui prend sa source sur le plateau du Fouta-Djalon, coule vers le nord et l'est en forma...
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China - geografía.
permiten la ubicación de puertos naturales. Hacia el sur de las colinas de Nan Ling está la depresión del Xi Jiang, una zona montañosa de suelos poco fértiles; sin embargo,los numerosos arroyos de la región están bordeados por valles aluviales planos y fértiles. La amplia planicie deltaica del Zhu Jiang (río Perla) se conoce comúnmente comodelta de Cantón. 2.1. 6 La meseta Tibetana En el extremo suroeste de China está la alta meseta del Tíbet, enmarcada por montañas; es la meseta más elevada de...
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First Americans.
bones and artifacts helped 19th-century archaeologists establish the age of ancient human encampments in Europe. Yet, search as they might, American archaeologists found no comparable evidence of a Pleistocene-era human presence. But several sites revealed stone artifacts thatsome scholars believed looked similar to the ancient stone tools found in Europe. On the basis of this similarity, these experts claimed the American artifacts must be asold. By the 1890s, however, other scholars had challe...
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First Americans - Canadian History.
bones and artifacts helped 19th-century archaeologists establish the age of ancient human encampments in Europe. Yet, search as they might, American archaeologists found no comparable evidence of a Pleistocene-era human presence. But several sites revealed stone artifacts thatsome scholars believed looked similar to the ancient stone tools found in Europe. On the basis of this similarity, these experts claimed the American artifacts must be asold. By the 1890s, however, other scholars had challe...
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Africa - history.
Africa’s other major mountainous regions occur at the northern and southern fringes of the continent. The Atlas Mountains, a system of high ranges, extend for 2,200 km(1,400 mi) across Morocco, Algeria, and Tunisia, roughly parallel to the northern coast. These ranges enclose a number of broad inland basins and plateaus. In the west, theHigh (or Grand) Atlas contains Toubkal (4,165 m/ 13,665 ft), the highest peak of the system. Toward the east, the Atlas consists of two parallel ranges: the Tell...
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Africa.
The highest elevations in Africa are found in the various ranges of East Africa. After Kilimanjaro, the next highest peaks are Mount Kenya (5,199 m/17,057 ft), north ofKilimanjaro in central Kenya; Margherita Peak (5,109 m/ 16,762 ft) in the Ruwenzori Range on the border between Uganda and the Democratic Republic of the Congo(DRC); Ras Dashen (4,620 m/ 15,157 ft) in the Ethiopian Highlands of northern Ethiopia; Mount Meru (4,565 m/ 14,977 ft), close to Kilimanjaro in Tanzania; and MountElgon (4,...
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North Dakota - geography.
Bismarck, the growing season averages 134 days, as the average date of the last killing frost is May 11 and that of the first killing frost is September 22. The length ofthe growing season drops to about 110 days in the northerly reaches of the state. The long periods of summer sunshine at this latitude, providing as much as 16 hoursof daylight in summer, help crops to mature quickly, thus compensating somewhat for the relatively short growing season. Temperatures in the north are, on the averag...
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North Dakota - USA History.
Bismarck, the growing season averages 134 days, as the average date of the last killing frost is May 11 and that of the first killing frost is September 22. The length ofthe growing season drops to about 110 days in the northerly reaches of the state. The long periods of summer sunshine at this latitude, providing as much as 16 hoursof daylight in summer, help crops to mature quickly, thus compensating somewhat for the relatively short growing season. Temperatures in the north are, on the averag...
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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...
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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...
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North Carolina - geography.
The drainage divide in North Carolina follows the Blue Ridge range on the eastern margin of the mountain region. This is called the “Eastern Continental Divide.” West ofthis divide, rivers drain into the Mississippi River through the Tennessee River and other tributaries of the Ohio River. The French Broad, the largest, and the LittleTennessee flow into the Tennessee River. The New River flows into the Kanawha River of West Virginia which in turn flows into the Ohio River. Most of the state’s ri...
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North Carolina - USA History.
The drainage divide in North Carolina follows the Blue Ridge range on the eastern margin of the mountain region. This is called the “Eastern Continental Divide.” West ofthis divide, rivers drain into the Mississippi River through the Tennessee River and other tributaries of the Ohio River. The French Broad, the largest, and the LittleTennessee flow into the Tennessee River. The New River flows into the Kanawha River of West Virginia which in turn flows into the Ohio River. Most of the state’s ri...
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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...
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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...
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Native Americans of North America.
addition to smallpox and measles, explorers and colonists brought a host of other diseases: bubonic plague, cholera, typhoid fever, scarlet fever, pleurisy, mumps,diphtheria, pneumonia, whooping cough, malaria, yellow fever, and various sexually transmitted infections. Despite the undisputed devastation wreaked on Indian populations after European contact, native populations showed enormous regional variability in their response todisease exposure. Some peoples survived and, in some cases, even...
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Native Americans of North America - Canadian History.
addition to smallpox and measles, explorers and colonists brought a host of other diseases: bubonic plague, cholera, typhoid fever, scarlet fever, pleurisy, mumps,diphtheria, pneumonia, whooping cough, malaria, yellow fever, and various sexually transmitted infections. Despite the undisputed devastation wreaked on Indian populations after European contact, native populations showed enormous regional variability in their response todisease exposure. Some peoples survived and, in some cases, even...
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CHINE:
Le géant aux pieds d'argile.
lian gdao ng ou TAÏWAN CHINE Le géant aux pieds d'argile Malgré l'importance de ses ressources, la Chine est freinée dans son développement par une surpopulation et une struaure politique encore peu encline à la démocratisation. La Chine du début du xx• siècle est encore caractérisée par une économie traditionnelle, certes ingénieuse mais néanmoins archaïque. La grande majorité de la population chinoise, qui ne cesse d'augme...
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Pennsylvania - geography.
B Rivers and Lakes There are three major river basins in Pennsylvania: the Susquehanna, the Ohio, and the Delaware. Together they drain more than 90 percent of Pennsylvania’s landarea. Most of eastern and central Pennsylvania is drained by the Susquehanna and Delaware systems. The western part of the state is drained by the Allegheny andMonongahela rivers, which join at Pittsburgh to form the Ohio. In addition to the three major river basins, short streams flowing into Lake Erie drain the north...
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Pennsylvania - USA History.
B Rivers and Lakes There are three major river basins in Pennsylvania: the Susquehanna, the Ohio, and the Delaware. Together they drain more than 90 percent of Pennsylvania’s landarea. Most of eastern and central Pennsylvania is drained by the Susquehanna and Delaware systems. The western part of the state is drained by the Allegheny andMonongahela rivers, which join at Pittsburgh to form the Ohio. In addition to the three major river basins, short streams flowing into Lake Erie drain the north...
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La péninsule Arabique (Travaux Personnels Encadrés – Géographie - Enseignements Pratiques Interdisciplinaires)
Le secteur agricole, où la culture du qat (plante narcotique) supplante celle du café, n'offre plus que des perspectives limitées . Tout développement supposerait une extension de l'irrigation , solution quasi impossible en raison de l'épuisement des ressources aquifères . D ' autres possibilités de développement ont redonné de l'espoir, grâce à la récente découverte d'hydrocarbures. Cependan~ les conditions d'exploitation se révèlent délicates et les...
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Vermont - geography.
Forests cover 78 percent of Vermont. Most of the trees are deciduous, principally the maple, elm, birch, beech, oak, hickory, ash, cherry, and butternut. The state treeis the sugar maple, which provides Vermont’s famous maple syrup. Conifers are common in some mountain areas and include mainly the white pine, red spruce,hemlock, and cedar. A great variety of ferns have been found within the state. Among the more common wildflowers that grow in Vermont are anemones, arbutuses,violets, lilacs, dai...
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Vermont - USA History.
Forests cover 78 percent of Vermont. Most of the trees are deciduous, principally the maple, elm, birch, beech, oak, hickory, ash, cherry, and butternut. The state treeis the sugar maple, which provides Vermont’s famous maple syrup. Conifers are common in some mountain areas and include mainly the white pine, red spruce,hemlock, and cedar. A great variety of ferns have been found within the state. Among the more common wildflowers that grow in Vermont are anemones, arbutuses,violets, lilacs, dai...
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Ship.
I
INTRODUCTION
Ship, vessel that is buoyant in the water and used
B1 Biremes Experience soon proved that longer ships posed a new set of problems: They were weaker structurally, more difficult to maneuver, and presented a larger target to anyenemy ship with a ram. In the 8th century BC Mediterranean shipbuilders eliminated these problems with the bireme , a war galley built to accommodate two levels, or banks , of oarsmen. Oarsmen on the lower level rowed oars from ports cut into the side of the vessel, while those above rowed from the deck. This arrangemen...
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Indien - geographie.
immergrüne Pflanzen, Bambus und Edelholzarten wie etwa Teakholzbäume. In den sumpfigen Tiefländern und entlang der tiefer gelegenen Hänge der Westghats befindensich ausgedehnte Dschungelgebiete. Die Vegetation im Hochland von Dekkan ist zwar weniger üppig, es finden sich aber auf der gesamten Halbinsel immer wieder Bambus-und Palmenbestände sowie Laubwälder. 2.4 Fauna Die Wälder, Ebenen, Hügel und Berge in Indien sind Lebensraum einer vielfältigen Tierwelt. Das gilt auch für Großkatzen wie Tige...
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Vereinigtes Königreich Großbritannien und Nordirland - geographie.
Wild lebende Großsäugetiere sind Rothirsche und Rehe sowie die eingebürgerten Damhirsche, Sikahirsche, Wasserrehe und Muntjaks (die beiden letzteren in Südengland).Die früher heimischen Wölfe und Wildschweine wurden ausgerottet. In Exmoor, auf den Shetland-Inseln und im New Forest gibt es halbwilde Ponys. Insgesamt entsprichtdie Säugetierfauna Großbritanniens weitgehend derjenigen Mitteleuropas. Das Eichhörnchen wird durch das ausgesetzte nordamerikanische Grauhörnchen verdrängt. InSüdengland le...
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India - country.
delta in the north, are intensely farmed. B Rivers and Lakes The rivers of India can be divided into three groups: the great Himalayan rivers of the north, the westward-flowing rivers of central India, and the eastward-flowingrivers of the Deccan Plateau and the rest of peninsular India. Only small portions of India’s rivers are navigable because of silting and the wide seasonal variation inwater flow (due to the monsoon climate). Water transport is thus of little importance in India. Barrages,...
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Maya Civilization - history.
III CLASSIC PERIOD Maya Ruins, El SalvadorThe Maya occupied a large part of Central America, and their civilization reached its height between ad 300 and 900. Many ruins ofthe ancient civilization have been excavated in El Salvador, including huge limestone pyramids.Susan McCartney/Photo Researchers, Inc. Classic Maya civilization became more complex in about AD 300 as the population increased and centers in the highlands and the lowlands engaged in both cooperation and competition with each o...
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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...
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Virginia (state) - geography.
C Coastline Virginia’s coastline, for both the mainland and the Eastern Shore counties, is 180 km (112 mi) long. The state’s tidal shoreline measures 5,335 km (3,315 mi), includingall bays, inlets, tidal estuaries, and other indentations. Major indentations include Chesapeake Bay; Hampton Roads, the excellent natural harbor on which are locatedNewport News, Norfolk, and Portsmouth; and the wide tidal estuaries of the lower Potomac, James, Rappahannock, and York rivers. Cape Henry, in the southe...
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Virginia (state) - USA History.
C Coastline Virginia’s coastline, for both the mainland and the Eastern Shore counties, is 180 km (112 mi) long. The state’s tidal shoreline measures 5,335 km (3,315 mi), includingall bays, inlets, tidal estuaries, and other indentations. Major indentations include Chesapeake Bay; Hampton Roads, the excellent natural harbor on which are locatedNewport News, Norfolk, and Portsmouth; and the wide tidal estuaries of the lower Potomac, James, Rappahannock, and York rivers. Cape Henry, in the southe...
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Londres - geografía.
Templo hindú en LondresEl Shri Swaminarayan Mandir es el templo hindú más grande construido fuera de India.Jon Arnold/age fotostock La llegada de inmigrantes ha contribuido considerablemente a cambiar la composición étnica de la población de la ciudad. El 46% de la población perteneciente a minoríasraciales de Inglaterra vive en Londres, y se calcula que en uno de cada cinco hogares, el inglés no es la lengua materna. Aunque esta mezcla racial ha producido enocasiones enfrentamientos y tensiones...
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Guinea - country.
Mining operations in 2004 yielded 16 million metric tons of bauxite, 468,400 carats of high-quality diamonds, and 16,000 kg (35,300 lb) of gold. Environmental concernsand political instability in neighboring Liberia have delayed exploitation of high-grade iron ore from Mount Nimba. In 1999 the national budget included $466 million in revenues and $414 million in expenditures. The unit of currency is the Guinean franc, which is divided into 100 centimes (3,644 francs equal U.S.$1; 2005 average...
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turbine.
Au début du XXe siècle, la demande croissante en électricité d’origine hydroélectrique rendit nécessaire le développement d’une turbine pouvant être adaptée à de faibles hauteurs de chute d’eau, de 3 à 9 m, et utilisable sur de nombreuses rivières où de petites retenues pouvaient être construites. En 1913, l’ingénieur autrichien Viktor Kaplan proposa pour la première fois son turbopropulseur, qui fonctionne comme une hélice de bateau inversée. Il améliora par la suite cette turbine à écoulemen...
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Cheetah - biology.
animals such as zebras. Unlike most cats, cheetahs hunt during the day, when lions and hyenas that compete with them for prey are less likely to be active. Still,scientists in Tanzania have observed that cheetahs lose 10 to 13 percent of their kills to lions and hyenas. Alerted by the panic of a gazelle herd or by the circling ofvultures, lions and hyenas close in and easily drive the more timid cheetah away from a fresh kill. A cheetah usually stalks prey to within about 10 m (about 33 ft) and...
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Allemagne.
de la mer du Nord. 2.3 Climat L’Allemagne est soumise à un climat de transition, caractérisé par l’affrontement entre les influences océanique et continentale. La continentalité s’accentue vers l’est et lesud-est. Lorsque prévaut l’influence océanique, les pluies hivernales sont abondantes, les étés sont tièdes et pluvieux. L’influence continentale, en revanche, se traduit parde grandes chaleurs estivales et des hivers froids. Elle est surtout marquée à l’est de l’Elbe mais, à partir du mois de...
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Kasachstan - geographie.
Die Analphabetenquote liegt bei 2 Prozent (Frauen 4 Prozent, Männer 1 Prozent). Die allgemeine Schulpflicht dauert acht Jahre. In Astana hat die Eurasische UniversitätGumiljow ihren Sitz. 4.2 Literatur und Musik Die traditionelle Literatur der Nomaden beruht auf mündlicher Überlieferung durch Sänger und Erzähler. Erst im 19. Jahrhundert wurden diese Epen aufgeschrieben undgesammelt. Unter russischem Einfluss entwickelte sich seit dem 19. Jahrhundert eine schriftliche Literatur. Zu ihren Exponen...
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Tunesien - geographie.
3.3 Soziales Tunesien zählt zu den wohlhabenderen Ländern des afrikanischen Kontinents. Die Arbeitslosenquote beträgt 15,5 Prozent. Das Gesundheitswesen ist gut ausgebaut, in dermedizinischen Versorgung besteht jedoch immer noch ein beträchtliches Stadt-Land-Gefälle. Auf einen Arzt kommen 745 Einwohner. Die Kindersterblichkeitsrate liegt bei22 Sterbefälle pro 1 000 Lebendgeburten. Für die Mehrheit der Bevölkerung ist die medizinische Versorgung kostenfrei. Die durchschnittliche Lebenserwartung...
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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...
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Brasilien - geographie.
3 BEVÖLKERUNG Die Einwohnerzahl beträgt etwa 192 Millionen (2008). Dies entspricht einer Bevölkerungsdichte von rund 23 Einwohnern pro Quadratkilometer. Die Bevölkerung ist sehrungleich über das Land verteilt, etwa 84 Prozent der Brasilianer leben in Städten. Aufgrund der wechselvollen Geschichte des Landes ist seine Bevölkerung ethnisch sehr heterogen zusammengesetzt. Etwas mehr als die Hälfte der brasilianischenBevölkerung sind Weiße (u. a. 15 Prozent portugiesischer, 11 Prozent italienischer...
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Northwest Territories - Geography.
million years ago by the severe bending (folding) and faulting (breaking) of sedimentary rock that was once part of the Interior Plains. During the Wisconsin Ice Age,alpine glaciers covered the Cordillera, and the movement of the glaciers created razor-sharp peaks and ridges in these mountains. The moving glaciers also createdbroad U-shaped valleys. To the east of the Interior Plains, the ancient rocks of the Canadian Shield are exposed at the Earth’s surface, resulting in a rough, rolling terra...