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The human population has grown exponentially in recent centuries due to lowered death rates from improved health and technology. The population has doubled 3 times in the last 3 centuries and is projected to reach 9.3 billion by 2050. Factors that affect population size include birth rates, death rates, life expectancy, immigration, and emigration.
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The document discusses population composition and structure. It defines population structure as the makeup or composition of a population. The two basic elements of population composition are sex structure and age structure. Sex structure is measured using the sex ratio, which is the number of males per 100 females. Age structure is analyzed using population pyramids, which graphically display the age and sex distribution of a population in 5-year cohorts. Population pyramids can reveal trends in birth rates, death rates, and other demographic influences. The dependency ratio compares the number of dependents to the working-age population.
AS GEOGRAPHY REVISION - MIGRATION - 5.1 MIGRATION AS POPULATION CHANGE
Geography AS Revision - Chapter 2 Human Geography - Migration - 5.1 Migration as a component of population change.
CAMBRIDGE AS GEOGRAPHY REVISION: POPULATION - 4.1 NATURAL INCREASE
A comprehensive revision for Cambridge AS Geography, chapter 4 Population, subchapter 4.1 Natural Increase.
Global demography
This document discusses global demography, population, urbanization, and ecology. It defines key demographic concepts like population, demography, fertility, mortality, and migration. It explains how demographers study and analyze population size, composition, distribution and changes. Tools of demography discussed include count, rate, ratio, proportion, and cohort/period measures. Population composition and density are addressed. The document details factors influencing global fertility rates, improvements reducing mortality, and impacts of migration on population structure. World population statistics from 2019 are also provided. The document concludes with an announcement about an upcoming quiz on global cities.
Population ecology 2011
Population ecology examines populations of species and how they change over time. Key features of populations include size, density, and dispersion. Population size is affected by birth and death rates. Density is measured as the number of individuals per unit area and is affected by factors like immigration, emigration, and environmental limits. Dispersion describes how organisms are spaced relative to each other, which can be clumped, even, or random. Populations can grow exponentially at first but eventually reach carrying capacity, where growth levels off due to environmental limits.
Population dynamics.g.p mhlawuli
This document provides an overview of population dynamics concepts for a Grade 11 geography class. It defines key terms like migration, immigration, emigration, natural change, crude birth rate, crude death rate, and crude growth rate. Diagrams illustrate how births, deaths, immigration and emigration interact to impact a population's size and growth. Factors like available resources, security, family planning access, and medical services can influence these population changes in an area. The class is encouraged to discuss pictures of different communities and analyze what population dynamics may be affecting each one. References for further reading on the topic are also provided.
Statistical distributions
This document discusses different types of statistical distributions that are found in nature. It provides examples of normal distributions that describe many biological traits like height and IQ, which tend to form a bell curve. Income distributions often follow a lognormal pattern with most people in lower income groups. Tree diameter distributions in natural forests typically take an inverse J-shape. Population age structures also form distinctive patterns over time, like a pyramid shape in the past with high child mortality rates.
Demography ( dr.sanjeev sahu)
demography ppt for public health,community medicine person.
describing demography in short with demographic trends in india.
Global Demography-The tools of demography
The document discusses global demography, population, and ecology. It defines key demographic concepts like population, demography, fertility, mortality, and migration. It also summarizes population composition and density, explaining crude density and how it varies globally. Tools of demography are outlined, including counts, rates, ratios, proportions, and cohorts. Fertility, mortality, and migration trends are summarized worldwide, showing variations in birth rates, life expectancy, and how migration impacts population structure. World population statistics are provided, listing the most populous countries as of 2019.
Population
The document discusses population growth and its impacts. It notes that the world population has doubled since 1960 and is expected to reach 9 billion by 2050. Overpopulation can create issues like increased consumption, disparity, and migration. Models like Malthus' predict population will outpace food growth, leading to famine, but technological advances have increased food supply. Boserup argued that population pressure spurs innovation to intensify agriculture and increase yields. However, overpopulation can also degrade the environment in fragile areas.
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Population, Urbanization,and Environment15ISBN1-.docx
Population, Urbanization,and Environment15ISBN1-.docx
GEOGRAPHY CAMBRIDGE IGCSE: POPULATION AND MIGRATION
GEOGRAPHY CAMBRIDGE IGCSE: POPULATION AND MIGRATION
AS GEOGRAPHY REVISION - MIGRATION - 5.1 MIGRATION AS POPULATION CHANGE
AS GEOGRAPHY REVISION - MIGRATION - 5.1 MIGRATION AS POPULATION CHANGE
CAMBRIDGE AS GEOGRAPHY REVISION: POPULATION - 4.1 NATURAL INCREASE
CAMBRIDGE AS GEOGRAPHY REVISION: POPULATION - 4.1 NATURAL INCREASE
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- 1. 1.6 Human Populations How does the human population growth curve differ from that of most other organisms? What factors affect the growth and the size of the human populations?
- 3. Factors affecting population size
- 6. Dispersion Clumped Diagram Example Uniform Diagram Example Random Diagram Example
- 7. Figure 35.2C
- 9. Clumped
- 11. Uniform
- 13. Random
- 16. Glossary Birth rate Death rate Life expectancy Immigration Emigration Demographic Transition
- 18. Birth rate
- 19. Death rate