Ap hug unit 2

Arithmetic density

The total number of people divided by the total land area: $\frac{\text{Total Population}}{\text{Total Land Area}}$.

Physiological density

The total number of people divided by the area of arable land: $\frac{\text{Total Population}}{\text{Arable Land}}$.

Agricultural density

The ratio of the number of farmers to the total amount of farmable land: $\frac{\text{Number of Farmers}}{\text{Arable Land}}$.

Expansive population pyramid

A population graph characterized by a wide base and narrow apex, indicating high birth rates and rapid natural growth.

Constrictive population pyramid

An age-sex diagram with a tapered base smaller than the middle cohorts, representing declining fertility and an aging citizenry.

Dependency ratio

A metric comparing non-working age groups to the productive labor cohort, calculated as $\frac{\text{Ages 0--14} + \text{Ages 65+}}{\text{Ages 15--64}} \times 100$.

Total Fertility Rate (TFR)

The average number of children a woman will bear across her childbearing years based on current age-specific fertility rates.

Rate of Natural Increase (RNI)

The annual percentage growth of a population derived strictly from vital statistics, calculated as $\frac{\text{CBR} - \text{CDR}}{10}$.

Demographic Transition Model (DTM) Stage 2

The historical phase marked by a sudden plunge in the Crude Death Rate due to improved sanitation and medicine while the Crude Birth Rate stays high, creating rapid population growth.

Demographic Transition Model (DTM) Stage 4

The stage where birth rates and death rates both stabilize at low levels, yielding very slow or stationary population growth.

Epidemiological Transition Model (ETM)

A conceptual framework describing how the primary causes of disease and death change from infectious epidemics to chronic, degenerative illnesses as societies develop.

Malthusian theory

The argument that human population multiplies exponentially ($1, 2, 4, 8\dots$) while agricultural food production increases only arithmetically ($1, 2, 3, 4\dots$), resulting in inevitable shortages.

Cornucopian theory

The perspective asserting that human innovation, technological advances, and market adaptation will consistently overcome resource limits and feed growing populations.

Pro-natalist policy

A government initiative offering incentives, tax breaks, or paid leave to stimulate higher birth rates and counter population aging.

Choropleth map

A thematic map that uses varying tonal gradations, patterns, or colors across predefined political or administrative areas to represent data values.

Cartogram

A thematic map that deliberately resizes and distorts geographic land boundaries in proportion to a specific statistical variable.

Geographic Information System (GIS)

A sophisticated computer system used for capturing, integrating, analyzing, layering, and displaying diverse spatial datasets.

Remote sensing

The method of gathering physical data and imagery of Earth surface features from aircraft, satellites, or distant sensors.

Scale of analysis

The specific level of data aggregation (such as neighborhood, county, state, or global) at which spatial patterns are examined.

Possibilism

The geographic concept stating that while the natural landscape sets certain constraints, human culture and ingenuity provide the choices to adapt and reshape surroundings.