Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Unit 6: Test 2

Population - Test 2

replacement rate the total fertility rate needed for a population to replace itself (This is usually around 2.1)
baby boomers people born after WWII, from 1946 to 1964 in the United States and Allied countries
pension a fixed amount of money paid regularly to a person, following retirement from work
dependency ratio the number of old and young dependents compared to the working population who supports them
doubling time the length of time it takes for a population to double
famine a severe shortage of food that results in widespread hunger
arable land land suitable for growing crops
arithmetic population density the population of a country divided by its total land area. This calculation assumes people can live anywhere within a country.
physiologic population density the population of a country divided by its total arable land area. This calculation takes into account that there are many places that people can’t live within a country.
Created by: AMS SS6