Census - The official count of a population (conducted every 10 years), Population Density - Number of things: People, animals, objects in a specific area, Overpopulation - The condition in which population outstrips the resources needed to support life, Natural Increase Rate - The percentage growth of a population in a year, Population Pyramid - A bar graph that represents the distribution of population by age and sex, Dependency Ratio - The number of people under the age of 15 and over the age of 64 compared to the number of people active in the labor force, Pandemic - A disease that occurs over a wide geographic area and affects a very high proportion of the population, Migration - The movement from one country, place or locality to another, Immigrant - Someone who moves to a new location, Emigrant - Someone who moves away from a location, Push Factor - A factor that compels someone to leave a location, Pull Factor - A factor that attracts someone to a new location, Chain Migration - Migration of people to a specific location because a relative or members of the same nationality previously migrated there, Refugee - A person who is forced to leave his or hers country for fear of persecution or death,

Unit 3: Population and Migration

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快閃記憶體卡是一個開放式範本。它不會為排行榜生成分數。

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