Human Population Flashcards Preview

Envirionmental Science 101 > Human Population > Flashcards

Flashcards in Human Population Deck (22)
Loading flashcards...
0

Demography

Branch of sociology. Studies characteristics of human population.

1

Demography includes

Age
Income
Ethnicity
Education

2

Population density

Is the number of individuals of a species per unit area at a given time.

-(important to know)different environments can sustain different population densities.

3

Populations are controlled by two factors

Birth rate
Death rate

4

What is birth rate?

Rate at which individuals produce off spring (based on fertility rates)

5

What is death rate

Rate at which individuals die

6

Carrying capacity

Earth can only support so many people before it reaches its carrying capacity

7

Geometric rate

1,2,4,8,17,32
If population is left unchecked will increase at a geometric rate

8

Linear rate

1,2,3,4,5
If pop uncheck food supply will grow at a linear rate

9

The population is checked through

Natural processes

10

Positive checks

Increase death rate

11

Positive checks include:

Disease
Famine
War

12

Preventative checks

Lowers birth rate

13

Preventative checks include:

Abortion
Birth control
Celibacy

14

What is Carrying Capacity

Maximum population that can be maintained w/0 degradation of natural systems.

15

What is doubling time

Amount of time for a population to double
-can be estimated according to the rule of 70

16

Doubling time formula

70/growth rate(%)
70/2%=35years

17

Invention of agriculture & domestication of animals

10,000 BC - 5million

18

First millennium

300 million

19

When did the population cross 1billion mark

1800= first billion mark

20

How many years did it take for pop to grow to 1billion

33yrs
Agriculture
Advances in medicine

21

Every population issue is a result of

Over population