Population Dynamics and Distribution Patterns of Longfin ...
2.3 Notes - Population Patterns
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Transcript of 2.3 Notes - Population Patterns
Section Objectives
• Explain why the world’s population is growing rapidly.
• Identify where most people in the world l ive.
• Discuss why more people are moving to cit ies.
Population Growth
• The world’s population is growing rapidly, and how and where people l ive are changing too.• World Population Growth in History
(2:15-7:32 - can fast forward)
• U.S. and World Population TODAY
• World Population (Constant Count w/Estimator)
PopulationGrowth (cont.)
• The world’s population continues to grow.
• The death rate, or the number who die out of 1,000, has gone down because of better health care and l iving condit ions.
• The birth rate, or the number of children born each year for every 1,000 people, is very high in some regions.
PopulationGrowth (cont.)
• Challenges from population growth (overpopulation) include:• Rapid use of natural resources• Strain on a country’s economy • Lack of food, or famine
• Experts are optimistic that, despite the high population growth, advances in technology and creativity wil l make it possible for population growth to be managed.
Where People Live• 30% of the earth is covered by land.
• 50% is uninhabitable because of ice, deserts, or high mountains. (15%)
• The world’s population is not distr ibuted evenly.
• People prefer to l ive in places with:
• Plentiful water • Good land • Favorable climate
Population Density• Population density is the average number of
people l iving in a square mile or square kilometer.
• To f igure population density, the total population is divided by the total land area.• US pop. = 318,710,000• Land area = 3,794,100 square miles• 318,710,000 divided by 3,794,100 = 84 people per square mile
in the U.S.
• Other country totals:• Canada = 9 per square mile • Mexico = 148 per square mile • China = 368 per square mile • India = 953 per square mile • Singapore = 18,513 per square mile
Population Movement• Nearly 50% of the world’s
people l ive in cit ies.
• Now, many people are leaving vil lages and farms and moving to cit ies to f ind work. This is called urbanization.
• Cities and their suburbs keep expanding outward, a situation called urban sprawl.
PopulationMovement (cont.)
• Some people emigrate, or leave the country in which they were born and move to another country. They do this to:• Find jobs in the richer nations • Flee their country because of
wars, food shortages, or to escape persecution or disaster.
• These people are known as refugees.
• Once in a new country, they are called immigrants.