Glossary of *S Largent* Environmental Science Ch 4 Terms
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- vital statistics about people (births; deaths; where they live; total pop. size).
- Less-Developed Countries
- include countries in Africa; Asia; and Latin America; represent 80% of the world population and more than 90% of all projected growth.
- Developed Countries
- include the richer countries of North America; Western Europe; Japan; Australia; and New Zealand; populations in these countries are expected to decline significantly over the next century.
- the physical ability to reproduce.
- the actual number of offspring produced through sexual reproduction; usually described in terms of number of offspring of females.
- Crude Birth Rate
- the number of births in a year per thousand persons. (This is crude because it is not adjusted for certain population characteristics.)
- Total Fertility Rate
- number of children born to an average woman in a population during her entire reproductive life.
- Zero population growth
- occurs when births plus immigration in a population equal deaths plus emigration.
- Crude death/mortality rates
- the number of deaths per thousand persons in any given year.
- Life Span
- the oldest age to which a species is known to survive.
- Life Expectancy
- the average age that a newborn infant can expect to attain in any given society (i.e.; the average age of death).
- Age Structure Diagram
- involves grouping male and female individuals of a population into three age categories: pre-reproductive; reproductive; and post-reproductive; age structure diagram indicates whether a population is increasing; decreasing; or remaining constant.
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