767 résultats pour "higher"

• Economics.

  Malthus, nature's check was “positive”: “The power of population is so superior to the power of the earth to produce subsistence for man, that premature death must insome shape or other visit the human race.” The shapes it took included war, epidemics, pestilence and plague, human vices, and famine, all combining to level theworld's population with the world's food supply. The only escape from population pressure and the horrors of the positive check was in voluntary limitation of population, no...

• Obesity.

  of a day, contributing to the development of obesity. V TREATMENTS FOR OBESITY Obesity can become a chronic lifelong condition caused by overeating, physical inactivity, and even genetic makeup. No matter what the cause, however, obesity can beprevented or managed with a combination of diet, exercise, behavior modification, and in severe cases, weight-loss medications and surgery. A Diets The most common and conservative treatment for obesity utilizes a nutritionally balanced, low calorie diet...

• Iraq - country.

  The Euphrates begins in Turkey, crosses Syria, and enters Iraq at Abū Kam āl. The flow of the Euphrates into Iraq has been greatly reduced by dams built by Turkeyand Syria. The gradient of the Euphrates above the town of H īt, in west central Iraq, is steep. In the 2,640 km (1,640 mi) from its source in Turkey to H īt, the river fallsfrom 3,000 m (10,000 ft) to a low water elevation of 50 m (170 ft) above sea level, an average drop of 1 m per km (6 ft per mi). In Iraq below H īt the fall is very...

• Telephone.

  digits is dialed. The development of inexpensive and reliable amplification provided by the introduction of the transistor in the 1960s made practical the design of adialing system based on the transmission of relatively low power tones instead of the higher-power dial pulses. Today most telephones have push buttons instead of a rotary dial. Touch-Tone is an optional service, and telephone companies still maintain the ability to receive pulsedialing. Push-button telephones usually have a switch...

• 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...

• New Hampshire - geography.

  Washington. D1 Temperature The coldest parts of the state are in the White Mountains and the extreme north. Average January temperatures range from about -11° C (about 12° F) along theCanadian border to about -3° C (about 26° F) along the coast. July temperatures range from about 17° C (about 63° F) in the mountains to about 21° C (about 70° F)in the south. D2 Precipitation Precipitation is evenly distributed throughout the year over most of the state. However, the higher peaks of the White Mo...

• New Hampshire - USA History.

  Washington. D1 Temperature The coldest parts of the state are in the White Mountains and the extreme north. Average January temperatures range from about -11° C (about 12° F) along theCanadian border to about -3° C (about 26° F) along the coast. July temperatures range from about 17° C (about 63° F) in the mountains to about 21° C (about 70° F)in the south. D2 Precipitation Precipitation is evenly distributed throughout the year over most of the state. However, the higher peaks of the White Mo...

• Prison.

  Furthermore, experts disagree about whether imprisoning criminals actually prevents further crime. Some critics charge that American prisons simply warehouseviolence—meaning that U.S. prison inmates are confined and incapacitated in large numbers, with little or no effort made to rehabilitate them. Critics have labeled theresult of this process turnstile justice, referring to the fact that most inmates are chronic and persistent offenders and return to prison following conviction for new crime...

• George Bush.

  1986 it was folded into Harken Energy Corporation, another Texas petroleum company. Bush served as a consultant and a member of Harken’s board of directors. In 1987 Bush relocated his family to Washington, D.C., to assist his father in his bid to become president. He worked as a campaign adviser at his father’s nationalcampaign headquarters, serving as a liaison to the media and to conservative and Christian leaders. He was a trusted confidant of his father and mother, whosometimes dispatched Bu...

• George Bush - USA History.

  1986 it was folded into Harken Energy Corporation, another Texas petroleum company. Bush served as a consultant and a member of Harken’s board of directors. In 1987 Bush relocated his family to Washington, D.C., to assist his father in his bid to become president. He worked as a campaign adviser at his father’s nationalcampaign headquarters, serving as a liaison to the media and to conservative and Christian leaders. He was a trusted confidant of his father and mother, whosometimes dispatched Bu...

• Europe .

  D Vegetation Although much of Europe, particularly the west, was originally covered by forest, the vegetation has been transformed by human habitation and the clearing of land.Only in the most northerly mountains and in parts of north central European Russia has the forest cover been relatively unaffected by human activity. On the otherhand, a considerable amount of Europe is covered by woodland that has been planted or has reoccupied cleared lands. The largest vegetation zone in Europe, cuttin...

• Europe - Geography.

  D Vegetation Although much of Europe, particularly the west, was originally covered by forest, the vegetation has been transformed by human habitation and the clearing of land.Only in the most northerly mountains and in parts of north central European Russia has the forest cover been relatively unaffected by human activity. On the otherhand, a considerable amount of Europe is covered by woodland that has been planted or has reoccupied cleared lands. The largest vegetation zone in Europe, cuttin...

• Antelope - biology.

  antelopes still display complex patterns of behavior, although much of it is instinctive rather than learned. In open habitats, antelopes run a high risk of predation (being preyed upon). To survive they use several kinds of defensive strategy, including living in herds. Herd living ensures that many pairs of eyes and ears are on the alert for danger. Herd living also gives individuals a better chance of avoiding attack, because predators canchoose from many potential targets. When danger thre...

• Azerbaijan - country.

  second most important industrial center after Baku. A Ethnic Groups Azerbaijan, including the autonomous exclave of Naxçivan, is populated mostly by ethnic Azerbaijanis, who are also known as Azeris. The ethnic composition of thecountry changed due to a civil war between the government of Azerbaijan and Armenian secessionists in the Nagorno-Karabakh enclave. Beginning in 1988, when thepeople of Nagorno-Karabakh unilaterally decided to secede from Azerbaijan, nearly the entire Azerbaijani popula...

• Tajikistan - country.

  by more than 100 percent due to a high birth rate and improvements in medical care. During the early 1990s, however, the growth rate began to decline due to civilwar and emigration. A Ethnic Groups and Languages Tajiks constitute the largest ethnic group in Tajikistan, making up about 65 percent of the population. The peoples who live in Gorno-Badakhshan, located in the Pamirs,are classified as Tajiks, although their languages and customs are distinct. The largest minority group in the country...

• Planetary Science - astronomy.

  III ORIGINS AND COMPOSITIONS OF PLANETS Astronomers believe that planetary systems are formed of elemental materials that were created in the interiors of giant stars. Some of this material comes from giantstars that shed material into space as they age. Most of the matter to form planets, however, comes from stars that explode as supernovas and spread debris enrichedwith the heavier chemical elements into space. According to the currently accepted views, the most likely first stage in the evo...

• Jakarta - geography.

  voluntary movement of families to Indonesia's less populated islands). Jakarta is a magnet for migrants from other areas of Indonesia; during the late 1980s an estimated 250 migrants arrived daily. Most were between the ages of 15 and39 years, many with six years of education or less. There is also a significant number of commuters and seasonal migrants who work in government, manufacturing,and services. In addition, many of these temporary residents are engaged in informal employment as drivers...

• Kolkata - geography.

  area, and trains have north-south lines with a few east-west connections. There are two major train terminals: Sealdah in the east central part of Kolkata and Hāoraacross the river from the Central Business District. Electric trams operate in Kolkata proper. The aging buses, trains, and tram cars suffer from overloading, creatinguncomfortable rides. Subway construction started in 1972 and became operational with 7 km (4.3 mi) of line in 1984. By 1995 all of the subway’s 16.4-km (10.2-mi)route fr...

• Tobacco - biology.

  quality cigars are made entirely by hand, most cigars are manufactured by machine. Chewing tobaccos are generally made from thick grades of leaves to which binders and flavorings are added. Chewing tobacco is formed by pressing the tobacco intoblocks known as plugs. Snuff is made by grinding tobacco into fine powder, which is then allowed to ferment for a long period of time. Frequently, snuff is scented withspices, such as jasmine or cloves. V TOBACCO INDUSTRY Over 6 million tons of commercial...

• Hong Kong - geography.

  higher than China’s average standard of living. In 2006 Hong Kong’s per capita gross domestic product (GDP) was $27,679.20, although much of the wealth isconcentrated into relatively few hands. IV ECONOMY Hong Kong’s position as one of the world’s most important economic centers is based on several factors. It is located midway between Japan and Singapore, and it liesastride the main shipping and air routes of the western Pacific. It also has long served as a major port of entry and trade for...

• Asia - geography.

  the Himalayas, the world’s highest mountain system. The Pacific Ocean plate drifted westward, scraping along the Eurasian plate and slipping under its coastal edge. This created the islands of Japan, Taiwan, the Kurils, theRyūky ūs, and the Philippines. Southeast Asia lies at the intersection of the Eurasian, Pacific Ocean, and Indian Ocean plates. Over time the contact between these platescreated the mountain ranges of mainland Southeast Asia. The continued slow movement of the plates causes fr...

• Asia - history.

  the Himalayas, the world’s highest mountain system. The Pacific Ocean plate drifted westward, scraping along the Eurasian plate and slipping under its coastal edge. This created the islands of Japan, Taiwan, the Kurils, theRyūky ūs, and the Philippines. Southeast Asia lies at the intersection of the Eurasian, Pacific Ocean, and Indian Ocean plates. Over time the contact between these platescreated the mountain ranges of mainland Southeast Asia. The continued slow movement of the plates causes fr...

• Georgia (country) - country.

  1917. During the subsequent Soviet period, religious practice was strongly discouraged because the Soviet state was officially atheistic; however, the GeorgianOrthodox Church was allowed to function openly. Orthodox Christianity is the religion of about 58 percent of the Georgian population. Muslims represent about 19 percent of the country’s population, with ethnicAzerbaijanis, Kurds, and Ajars comprising the principal Muslim groups. Ajars are ethnic Georgians who converted to Islam in the 17th...

• Swimming.

  the swimmer and the pinky finger should enter the water first. At the same time, the swimmer moves the left arm through the water below the left side of the body.Once in the water, the right arm begins pulling the swimmer forward by bending at the elbow. At the same time the swimmer holds the left arm straight as it reachesthe hip and lifts it out of the water. As the right arm continues to pull, the swimmer rotates slightly onto the right side and swings the left arm up above the head. As the s...

• Berlin - geography.

  boroughs of Wedding and Tiergarten. Other important central areas include Kreuzberg and Friedrichshain, now united as the Friedrichshain-Kreuzberg borough, andPrenzlauer Berg, now incorporated as a part of the Pankow borough. Tiergarten contains a large wooded park, a zoo, and a variety of public monuments as well as the large, modern Congress Hall and the Reichstag building, which wasbuilt from 1884 to 1894. The Reichstag and the surrounding area have undergone renovation to accommodate the Bun...

• Marriage.

  In many traditional societies, marriage typically involved transfers of property from the parents to their marrying children or from one set of parents to the other. Thesecustoms persist in some places today and are part of the tradition of arranged marriages. For example, in some cultures the bride’s parents may give property (knownas a dowry) to the new couple. The practice of giving dowries has been common in countries such as Greece, Egypt, India, and China from ancient times until thepresen...

• Western Philosophy.

  the popular belief in personal deities, but he failed to explain the way in which the familiar objects of experience could develop out of elements that are totally differentfrom them. Anaxagoras therefore suggested that all things are composed of very small particles, or “seeds,” which exist in infinite variety. To explain the way in whichthese particles combine to form the objects that constitute the familiar world, Anaxagoras developed a theory of cosmic evolution. He maintained that the activ...

• Columbus (Ohio) - geography.

  A balance among manufacturing, technology, research, and financial activities has helped Columbus’s economy to continue to boom. Much of the city’s expansion resultsfrom its function as a sophisticated service center. By 1990 manufacturing occupied only 12 percent of the area’s labor force. That contrasted with services, includinggovernment, finance, and transportation and utilities, which accounted for almost 60 percent of all employment. The two largest employers in Columbus are state governme...

• 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...

• William McKinley.

  gold standard. McKinley voted for it in exchange for support for his tariff bill. His vote angered Eastern bankers and industrialists but helped lessen Western oppositionto his stand on the tariff. D Governor of Ohio Because he was a champion of protective tariffs, as well as an extremely popular politician, McKinley attracted the attention of a Cleveland industrialist, Marcus AlonzoHanna. Hanna was eager to be the maker of a president and to be the man who exercised power behind the scenes. In...

• William McKinley

  gold standard. McKinley voted for it in exchange for support for his tariff bill. His vote angered Eastern bankers and industrialists but helped lessen Western oppositionto his stand on the tariff. D Governor of Ohio Because he was a champion of protective tariffs, as well as an extremely popular politician, McKinley attracted the attention of a Cleveland industrialist, Marcus AlonzoHanna. Hanna was eager to be the maker of a president and to be the man who exercised power behind the scenes. In...

• Artificial Satellite - astronomy.

  The first stage of a multistage rocket consists of rocket engines that provide a huge amount of force, or thrust. The first stage lifts the entire launch vehicle—with itsload of fuel, the rocket body, and the satellite—off the launch pad and into the first part of the flight. After its engines use all their fuel, the first stage portion of therocket separates from the rest of the launch vehicle and falls to Earth. The second stage then ignites, providing the energy necessary to lift the satellit...

• Hydrogen - chemistry.

  Hydrogen gas does not usually react with other chemicals at room temperature. That is, it does not split into two hydrogen atoms to combine with other chemicals. Thebond between the hydrogen atoms is very strong and can only be broken with a large amount of energy. However, when heated with a flame or a spark, hydrogen gaswill react violently with oxygen in the air to produce water in the following reaction: 2H2 + O 2 → 2H 2O This chemical equation shows that two hydrogen molecules (H 2) and o...

• Soil. I INTRODUCTION Soil, the loose material that covers the land surfaces of

  an exchange between plants and the atmosphere, as oxygen diffuses into the soil and is used by roots for respiration. In turn, the resulting carbon dioxide diffusesthrough pore spaces and returns to the atmosphere. This exchange is most efficient in soils with a high degree of porosity. For farmers, gardeners, landscapers, andothers with a professional interest in soil health, the process of aeration—making holes in the soil surface to permit the exchange of air—is a crucial activity. Theburrowi...

• Central America - Geography.

  F Animal Life Most of the animal life of Central America is similar to that of South America, but some animals have ties with North America. The marley and opossum have links withSouth America, as do the jaguar, ocelot, jaguarundi, and margay, which are members of the cat family. In contrast, the puma, gray fox, and coyote are of NorthAmerican origin. The armadillo, anteater, and sloth have ties to the south, deer to the north. The large manatee, an aquatic plant eater, survives in the isolated...

• Nanotechnology.

  ever-finer method of reducing material to the nanoscale size. Instead, nanostructures would be assembled atom by atom and molecule by molecule, from the atomiclevel up, just as occurs in nature. However, assembly at this scale has its own challenges. In school, children learn about some of these challenges when they study the random Brownian motion seen in particles suspended in liquids such as water. Theparticles themselves are not moving. Rather, the water molecules that surround the particles...

• Kyrgyzstan - country.

  are Bishkek, the capital, located on the Chu River in the far north; and Osh, located in the Fergana Valley. A Ethnic Groups Ethnic Kyrgyz make up about 65 percent of the population of Kyrgyzstan. Uzbeks, who live primarily in the Fergana Valley, constitute about 14 percent of thepopulation. Russians, who live principally in Bishkek and other industrial centers, make up about 13 percent of the population. Other ethnic groups include Hui (ChineseMuslims, also known as Dungans), Ukrainians, Uygur...

• Zimbabwe - country.

  contamination—especially from the dieldrin and DDT used in tsetse fly control—has significantly affected wildlife and human health. III PEOPLE AND SOCIETY OF ZIMBABWE In 2008 Zimbabwe’s population was estimated to be 12,382,920, giving the country a population density of 32 persons per sq km (83 per sq mi). With a birth rate of27 per 1,000 and a death rate of 22 per 1,000, Zimbabwe’s population growth rate is 0.6 percent. Life expectancy at birth was estimated at 40 years in 2008, downfrom 59...

• Guatemala - country.

  C Climate The climate of Guatemala varies according to elevation, from hot coastal plains to cold mountain heights. Most of the population lives between 900 and 2,400 m (3,000and 8,000 ft) above sea level, where there are warm days and cool nights with average annual temperatures of 20°C (68°F). The coastal regions are hot and humid,with average annual temperatures of 28°C (83°F). A rainy season, from May through October, is sometimes called “winter” because it brings cloudy afternoons andlower...

• Lopez Wins Five.

  The victory tied the all-time LPGA mark of four consecutive titles held by Shirley Englehorn, Kathy Whitworth, and Mickey Wright (who did it twice). Boosting her1978 earnings to a tour-best $118,948, Lopez reached the $100,000 plateau earlier in the season than any LPGA player before her. In her 20 pro appearances to thatpoint, she had finished below 16th only three times. Lopez was nervous about the upcoming tournament when she arrived at the Locust Hill Country Club in Pittsford, New York,...

• Robot.

  V IMPACT OF ROBOTS Robotic manipulators create manufactured products that are of higher quality and lower cost. But robots can cause the loss of unskilled jobs, particularly on assemblylines in factories. New jobs are created in software and sensor development, in robot installation and maintenance, and in the conversion of old factories and the designof new ones. These new jobs, however, require higher levels of skill and training. Technologically oriented societies must face the task of retra...

• Communism

  access to, resources, but the underlying principle is quite similar. Rather than freeing some or even all people in a society to devote themselves to a higher cause, secular communism is designed to allow everyone to pursue personal fulfilment. It may best be characterized by a slogan adopted by Marx that appears to have been first published on the title page of Cabet's Voyage en Icarie (1840): ‘From each according to his ability, to each according to his need' . In other words, each pers...

• Anxiety.

  A Genetics and Neurobiology Studies suggest that anxiety disorders run in families. That is, children and close relatives of people with disorders are more likely than most to develop anxietydisorders. Some people may inherit genes that make them particularly vulnerable to anxiety. These genes do not necessarily cause people to be anxious, but the genesmay increase the risk of anxiety disorders when certain psychological and social factors are also present. Anxiety also appears to be related to...

• Sydney (Australia) - geography.

  kept pace with demand, mostly through the outward expansion of the metropolitan area. More housing has been created recently in inner areas, including the CBD, onredeveloped industrial sites and in converted commercial buildings. Several outlying areas are part of the greater Sydney conurbation (a large urban area formed by urban sprawl). To the west are areas of commercial strip development extending from Penrith through the Blue Mountains; to the north are the Central Coast area centered on...

• 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...

• Portland - geography.

  Garden arena, which opened in 1995. In 2000 the Portland Fire, an expansion Women's National Basketball Association team, began play in the Rose Garden as well. VI ECONOMY Portland enjoys a diversified economy. Major manufactured products include paper, transportation equipment, metal products, sportswear, and electronic componentsand equipment. Major corporations headquartered in the metropolitan region include Nike, a leader in the manufacture of sports footwear, in Beaverton; Louisiana-Paci...

• Drug Dependence.

  these drugs develops rapidly, no withdrawal syndrome is apparent when they are discontinued. Phencyclidine, or PCP, known popularly by such names as “angel dust” and “rocket fuel,” has no medical purpose for humans but is occasionally used by veterinarians asan anesthetic and sedative for animals. It became a common drug of abuse in the late 1970s, and is considered a menace because it can easily be synthesized. Itseffects differ from those of other hallucinogens. LSD, for example, produces deta...

• Church of Jesus Christ of Latter-day Saints.

  yearly visited a book written in a hieroglyphic script on golden plates buried in a nearby hill; the book’s location, he said, had been disclosed to him by an angel. In 1830he completed the translation of these plates, “by the gift and power of God,” and published the Book of Mormon, which he believed to be a religious record of theancient inhabitants of North America. On April 6, 1830, he organized the Church of Christ, soon known by its present title, the Church of Jesus Christ of Latter-daySa...