Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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
Know
remaining cards
Save
0:01
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:
Retries:
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

Vocab234

QuestionAnswer
eon the longest unit of geologic time
eras eons are subdivided into smaller units of time
periods eras are subdivided into periods
epochs periods are divided into epochs
mass extinction the extinction of many species on earth within a short period of time
land bridge connects two continents together that were previously separated
geographic isolation The separation of a population of orgasms from the separation of the rest of its species
Paleozoic era the oldest era of the phonetician eon
mesozoic the middle era Phanerozoic
Cenozoic era the youngest era
Inland sea a body of water formed when ocean water floods continents
coal swamp an oxygen-poor environment where, over time, plant materials changes into coal oils
supercontinent an ancient landmass which separated into present daycontinents
Created by: nicossam3865