AP environmental science

Population Change
is calculated by subtracting the number of ppl leaving(emigration/death) from the number of entering (immigration/birth)
Crude Birth Rate
The number of live births per 1,000 ppl in a population any given year
Crude Death Rate
The number of deaths per 1,000 ppl in a population any given year
migration of ppl into a country or area to take up permanent residence
migration of people out of a country to leave their previous residence
Replacement Level fertility
number of children a couple must have to replace themselves
Total fertility Rate
an estimate of the average number of children a woman will have during her childbearing years if between ages of 15 and she bears children at the same rate as woman did this year
Demographic Transition
as countries become industrialized, first death rates and then birth rates decline
Infant Mortality Rate
number of babies out of  every 1,000 born who die before their first birthday
Life Expectancy
average number of years a newborn infant can be expected to live
 Age Structure Diagram
the proportion of the population/gender at each age level
Baby Boom Generation
following the great depression and WWII birth rates sky rocketed, 79 million ppl were added to the U.S.


Zero Population Growth (ZPG)
State in which the birth rate + immigration equals the death rate + emigration, so the population of a geographic area is no longer increasing