Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

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.
Your email address is only used to allow you to reset your password. See 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.
Didn't know it?
click below
Knew it?
click below
Don't Know
Remaining cards (0)
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


Environmental Challenges

Megalopolis Areas where cities have grown so large they run into each other
Developing country Countries seeking to industrialize, but still wanting to follow traditional ways
Developed countries Like the U.S., have long been industrialized and can offer a higher standard of living
Standard of Living The measure of a persons's wealth and personal well-being
Deforestation The clearing of forests
Habitat The special environments required for particular organisms to live
Desertification The turning of fertile land into desert
Droughts Long periods without rain
Subsistence farmers People who grow just enough food to meet their needs
Slums The rundown, poverty-stricken portions of a city
Nonrenewable resource Fuels that take millions of years to produce, when they run out, they will be gone forever
Acid rain Poisonous downpours
Greenhouse effect Gases that trap solar energy in the form of heat, the same way that a nursery greenhouse does
Chlorofluorocarbons (CFC's) The gases used in aerosols, air conditioning, refrigerators, and foam packaging, has also raised concern among scientists
Ozone layer A thin, protective layer of gas in the upper atmosphere
Ozone hole Seasonal reduction of ozone over Antarctica
Sustainable development Economic development that does not limit the ability of future generations to meet their needs
Green Revolution A solution to feeding the world's population
Popular History sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards