why is population increasing at different rates in different countries
A country moves from high birth rates and death rates, with little population growth, to low birth rates and death rates, with low population growth. During this process, the total population increases dramatically because the death rates decline before the birth rate does. The MDC's have slower growth rates while the LDC's have a period of rapid population growth. All countries have experienced some changes in NI, fertility, and mortality rates, but at different times and at different rates. A similar process of change in a society's population is occurring known as the
Demographic Transition. This process has several stages, and every country falls into one of them. Low Growth: There are very high birth rates and death rates. The burst of population in 8,000 b. c was caused by the, which was the time when humans first domesticated plants and animals and no longer relied entirely on hunting and gathering. High Growth: There are rapidly declining death rates combined with very high birth rates. This produces a very high NI. Countries entered stage 2 after 1750 due to the, which led to a series of improvements in industrial technology that transformed the process of manufacturing goods. Also, the in the 20th century pushed many countries into stage 2. Medical technology spread to the poorer countries and helped eliminate the traditional causes of death. Moderate Growth: Birth rates rapidly decline, death rates continue to decline, and NIR begins to slow. Low Growth: There are very low birth/death rates, no longterm NI, and possibly a decrease. In this stage the CBR= CDR, and the NIR reaches zero. This condition is known as zero population growth. Population in a country is influenced by the Demographic transition in two ways- the percent age of the population in each age group and the distribution of males and females. This info can be displayed on a bar graph called a.
The shape is mainly determined by the CBR. The most important factor of age distribution is the, which is the number of people who are too young to work compared to the number of people in their productive years. The number of males to females in the population is the. In general, slightly more males are born than females. Countries display different population characteristics depending on their stage in the demographic transition. There are no countries today that remain in stage 1. There are many countries in stage 2 or stage 3 of the demographic transition. These countries have a rapid population growth and only a few of them are likely to reach stage 4 in the near future. In this article, it explains that MDC's have better technology and health standards, therefore they are able to control their population. But in may LDC's in Africa, they are unaware of the consequences and they do not have the same beliefs. For example, in the MDC's there are medicines and vaccines to treat illnesses and viruses. However, in LDC, they do not yet have the technology to produce these preventatives. These are a couple of the reasons explained in the article that affect population rates. All countries have experienced some changes in natural increase, fertility, and mortality rates, but at different times and different rates. Although rates very among countries, a similar process of change in a sociey's population, known as the demographic transition model. The demographic transition model is a process with several stages, and every county is in one of them. Stage one includes a very high CDR and a very high CBR. The natural increase is population steady. The reasons for high birth rate include: The reason for a very high CDR include: Stage 2 includes a CDR falling rapidly and a very high CBR. The natural increase is very rapid.
The reasons for high birth rate include: The reasons for a falling death rate include: Stage 3 includes a CBR that is falling rapifly and a CDR that is falling more slowly. There is a rapid increase in the natural increase. Reasons for change in CBR: Reasons for change in CDR Stage 4 has a CDR that is falling more slowly and a CBR that is doing the same. The rate of natural increase is very slow Reasons for change in CBR: Reasons for change in CDR: A country's stage of dempgraphic transition gives it a distintive population structure. Population in a country is influened in two ways: the percentage of the population in each age group and the distribution of males and females. The population of a coutry can be displayed in a graph called a population pyramid. The age structure of a population is extremely important in understanding similarities and differences among countries. The most important factor is the dependency ratio, which is the number of people who are too young or too old to work, compared to the number of people in the productive years. To compare the dependency ratios between countries, one can divide the population into three age groups. One third of the population is under age of 15 in LDCs and still in stage 2 in the DTM. The number of males per hundred females in the population is the sex ratio. Although the sex ratio varies from country to country, slightly more males than females are born. In the United States, males under age 15 exceed females 105: 100. Having caused the first break with the past through diffusion of medical technology, European and North American countries now urge other countries to complete the second break. This website is a great way for one to understand all stages of the demographic transition model. It goes in great depth in describing each stage.
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