Population
This is the maximum population size that an environment can sustain without degrading its resources, such as food and water supply.
What is Carrying Capacity?
This key statistic represents the average number of children a woman will give birth to during her childbearing years (15–49); a rate of 2.1 is considered the "replacement level."
What is the Total Fertility Rate?
This term describes a migrant who has fled their home country, arrived in another nation, and formally requested international legal protection as a refugee under international law.
What is Asylum Seekers?
In his 1798 essay, this English economist argued that food production increases arithmetically (1, 2, 3, 4...) while population grows geometrically (1, 2, 4, 8...), inevitably leading to catastrophic famine unless checked.
Thomas Malthus
If Country X and Country Y have identical total populations and total land areas, but Country X has a significantly higher physiological density, you can mathematically deduce this specific land characteristic about Country X.
What is a smaller amount of arable (farmable) land?
Calculated by dividing total population by total land area, this measure gives a basic overview of how crowded a country is.
What is Arithmetic Density?
A pyramid with a very broad base and sharply tapering top represents Stage 2 of the DTM, whereas a narrow base with a wide top represents this DTM stage.
What is stage 5 of the DTM?
Environmental disasters like floods, political persecution, conflict, and ethnic cleansing are primary triggers for this category of human movement.
Modern theorists who argue Malthus was right, but emphasize depletion of other vital resources (water, energy, clean air) due to global population growth are known as this.
A sudden, steep asymmetrical indent on the male side of a population pyramid between the ages of 20 and 40 typically indicates a historical conflict, whereas a sharp, temporary horizontal notch across both genders in a specific age cohort indicates this specific event.
What is a sharp drop in birth rate (or birth deficit) during a crisis (such as war, famine, or pandemic)?
This metric measures population divided by total arable (farmable) land, giving a clearer picture of food pressure than arithmetic density.
What is Physiological Density?
This classic model predicts how a population changes over time as a country industrializes, moving from high birth/death rates to low birth/death rates across 5 stages.
What is the Demographic Transition Model?
Unlike a refugee who crosses an international border, an individual who is forced to flee their home but remains within their home country's borders.
What is IDP?
These people point out that agricultural technology/innovation grows food supply faster than Malthus predicted (Green Revolution), and that poverty is a problem of resource distribution, not resource scarcity.
What is the critiques of Thomas Malthus' theory (Karl Marx/ Boserup)?
This highly selective form of voluntary migration—often encouraged by active recruitment policies in high-income nations—occurs when highly educated or skilled professionals emigrate en masse, leaving the origin country with a depleted tax base and severe skill shortages while heavily relying on financial remittances in return.
What is a brain drain?
This demographic phenomenon occurs when a nation's median age increases due to declining fertility rates and higher life expectancies, visually depicted by an inverted or "top-heavy" population pyramid (such as in Japan or Germany).
What is an Aging Population?
Developed by Abdel Omran, this model correlates health and causes of death with the stages of the DTM—shifting from infectious diseases (pestilence) to chronic degenerative diseases (like heart disease and cancer).
What is the Epidemiological Transition Model?
Job opportunities, safety, and stable infrastructure represent these types of migration factors.
What is pull factors?
While Stage 3 of Abdel Omran’s model marks the rise of chronic degenerative illnesses, this controversial proposed Stage 5 of the Epidemiological Transition Model is driven by three main factors: evolution, poverty, and increased global connectivity.
What is the re-emergence of infectious and parasitic diseases?
The outbreak of the Syrian Civil War in 2011 generated one of the largest displacement crises in modern history, simultaneously producing millions of refugees who crossed borders into neighboring countries like Turkey and Lebanon, alongside over 6 million people who remained trapped within Syria's borders, fitting this specific demographic classification.
What is an IDP?
Designed to boost declining birth rates, this type of government strategy includes policies like France's subsidized daycare ("Allocations Familiales") or tax breaks for large families.
What is a pro-natalist policy?
Created by the United Nations, this composite index measures gender disparity across three dimensions: reproductive health, empowerment, and labor market participation.
What is the GII?
Moving in stages (e.g., farm → town → big city) is step migration, whereas following family or community members to a specific destination through social networks is known as this type of migration
What is chain Migration?
E.G. Ravenstein noted in his Laws of Migration that every major migration stream produces a counterstream. However, when migrants face physical, political, or economic obstacles—such as a strict border wall or a sudden job offer mid-journey—geographers use this two-word term to describe these barriers.
What are intervening obstacles (or intervening opportunities)?
Distinct from permanent or step migration, this form of cyclical movement involves agricultural workers or pastoral nomads moving regularly between two specific locations in response to seasonal climate shifts or harvest cycles without establishing permanent residence.