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Section 1-Main Idea Geographers study how people are distributed on Earth’s surface.

Section 1-Key Terms Content Vocabulary death rate birthrate famine population densitypopulation density urbanization emigrate refugee

Section 1 According to the United Nations Population Fund, the world’s population has been climbing toward 7 billion people. The most remarkable aspect of this number is the percentage of young people. More than 42 percent of the world’s population is between 10 and 24 years old. ** We hit 7 billion at the end of 2011

Section 1 Population Growth The world’s population has increased rapidly in the past two centuries, creating many new challenges.

Section 1 Population Growth (cont.) The population on Earth today is more than 6 billion—up from 1 billion around One reason the population has grown so fast in the last 200 years is that the death rate has gone down. The death rate is the number of deaths per year for every 1,000 people.death rate

Section 1 Better health care and living conditions as well as more plentiful food supplies have decreased the death rate. Another reason the population has grown is high birthrates in Asia, Africa, and Latin America. The birthrate is the number of children born each year for every 1,000 people.birthrate Population Growth (cont.)

Section 1 Advances in technology, such as improved irrigation systems and the creation of hardier plants, help increase food production for the increasing population, even though warfare and crop failures can lead to famine, or a severe lack of food.famine Expected Population Growth Rates, 2005–2050 Population Growth (cont.)

A.A B.B C.C D.D Section 1 Approximately how many people live on Earth today? A.1 billion B.3 billion C.5 billion D.Over 6 billion

Section 1 Where People Live The Earth’s population is not evenly distributed.

Section 1 Where People Live (cont.) Land covers only about 30 percent of the Earth’s surface, and only half of this amount is usable by humans. The other half is deserts, mountains, and ice-covered lands that cannot support large numbers of people. On the usable land, population is not distributed, or spread, evenly.

Section 1 People naturally prefer to live in places that have fertile soil, mild climates, natural resources, and water resources. Two-thirds of the world’s people are clustered into five regions with good resources—East Asia, South Asia, Southeast Asia, Europe, and eastern North America. Where People Live (cont.)

Section 1 In most regions, more people live in cities than in rural areas because of the jobs and resources found there. Geographers find out how crowded a country or region is by measuring population density, or the average number of people living in a square mile or square kilometer. population density This figure is calculated by dividing the total population by the total land area. Where People Live (cont.)

A.A B.B C.C D.D Section 1 What do geographers measure to determine how crowded a country or region is? A.Population distribution B.Population density C.Birthrate D.Deathrate

Section 1 Population Movement Large numbers of people migrate from one place to another.

Section 1 Population Movement (cont.) Moving from place to place in the same country is known as internal migration. An example is the movement of people from farms and villages to cities. Such migrants are often in search of jobs. Urbanization is the growth of cities due to internal migration. Urbanization has occurred rapidly in Asia, Africa, and Latin America.Urbanization

Section 1 Population Movement (cont.) Movement between countries is called international migration. Some people emigrate, or leave the country where they were born and move to another.emigrate They are emigrants in their homeland and immigrants in their new country. World Immigrant Populations

Section 1 Population Movement (cont.) Immigration has increased greatly in the past 200 years, partly due to better transportation. “Push” factors, such as a shortage of farmland or few jobs in a region, may convince, or push, residents to emigrate. “Pull” factors, such as the lure of jobs, attract many immigrants to the United States.

Section 1 Population Movement (cont.) People who are forced to flee to another country to escape wars, persecution, or natural disasters are called refugees.refugees

A.A B.B C.C D.D Section 1 How might mass migrations of people impact the regions they leave? A.A decrease in population B.Loss of skilled or educated workers C.Less overcrowding D.All of the above

VS 1 World Population Summary Low death rates and high birthrates have led to rapid population growth. Some areas of the world are more densely populated than others. Nearly half of the world’s population lives in cities. People migrate from one place to another.

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Vocab1 death rate number of deaths per year out of every 1,000 people

Vocab2 birthrate number of children born each year for every 1,000 people

Vocab3 famine severe lack of food

Vocab4 population density average number of people living in a square mile or square kilometer

Vocab5 urbanization growth of cities

Vocab6 emigrate to leave a country and move to another

Vocab7 refugee person who flees to another country to escape persecution or disaster