4.3 Population Structure4 скачать в хорошем качестве

4.3 Population Structure4

ንላይን መማር ለምትፈልጉ በ 0979181185 በመመዝገብ መማር ትችላላችሁ Social Media TikTok: / tutor12ab Instagram: / @tutor12ab YouTube: / @tutor12 Telegram: https://t.me/tutor12ab 4.3 POPULATION STRUCTURE Age Structure in Africa • Age structure is characterized by the distribution of population into young, working, and old age groups. • Africa's population is predominantly young. • The median age of the population can be expressed from this perspective. • Low median age indicates a young population, as seen in Africa's 19.7 years median age by mid-2020. • High median age indicates a population with low and slow population growth rates. Types of Population Pyramids Expansive Pyramid • Identifies a high proportion of children, rapid population growth, and low proportion of older people. • Typical pattern for less economically developed countries due to lack of birth control, environmental factors, and poor healthcare access. Constructive Pyramid • Identifies a large elderly population with lower numbers of young people (ages 1-14). • Typically occurs in developed countries with adequate health services. Stationary Pyramid • Shows an unchanging pattern of fertility and mortality. • B = D, where B = Birth, D = Death, and Population growth rate is zero.