| A | B |
|---|
| agricultural density | the total number of farmers divided by the total amount of land suitable for farming |
| arithmetic density | the total number of people divided by the total land area |
| cold lands | areas, usually located near the North and south poles, that is always covered in permafrost that make unsuitable for farming |
| crude birth rate | the total number of live births in a year for every 1,000 people alive in the society |
| crude death rate | the total number of deaths in a year for every 1,000 people alive in the society |
| 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 |
| doubling time | the number of years that double a population, assuming a constant rate of natural increase |
| dry lands | areas that do not have enough water to grow crops but may contain useful natural resources |
| high lands | areas of high elevation that are sometimes steep and snow covered and sparsely populated, while others are plateaus that can be used for agriculture and are more densely populated |
| natural increase rate | the percentage of a population in a year, computed as the crude birth rate minus the crude death rate |
| physiological density | the number of people per unit of arable land(land suitable for agriculture) |
| population pyramid | a bar graph that represents the distribution of population by age and sex |
| sex ratio | the number of males per 100 females in the population |
| total fertility rate | the average number of children that a woman will have throughout her child bearing years |
| wet lands | areas, usually located near the equator, that receive high levels of precipitation which accompanied by high heat deplete the soil of nutrients for farming |
