Save
Busy. Please wait.
Log in with Clever
or

show password
Forgot Password?

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

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.
focusNode
Didn't know it?
click below
 
Knew it?
click below
Don't Know
Remaining cards (0)
Know
0:00
share
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

Geologic Time

Geology

TermDefinition
Geologic Time Scale Contains information about important events in earth's history. Divisions of time are determined by when major changes happened on earth.
Eon Largest unit of geologic time.
Era Second largest unit of geologic time.
Period Second smallest unit of geologic time.
Epoch Smallest unit of geologic time.
Absolute Age The approximate age of a rock or fossil in years.
Relative Age The age of a rock or fossil compared to other rocks or fossils (older / younger)
Half Life The time it takes for half of the radioactive, parent atoms to decay (change) to stable daughter atoms.
Relative Dating Using the law of superposition, the law of cross cutting, and index fossils in order to compare the age of rocks or fossils (older / younger)
Absolute Dating Using radiometric dating (half life) to determine the approximate age of a rock or fossil in years
Law of Superposition In undisturbed layers of sedimentary rock, the oldest rocks are at the bottom
Law of Crosscutting When a geologic feature (intrusion, erosion, fault) cuts through a rock layer, it is younger than the rock layer it cuts through
Index Fossil Fossil of an organism that lived for a relatively short time, but was widespread.
Trilobite An example of an index fossil
Created by: cyclonescience
Popular Earth Science sets

 

 



Voices

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:
Retries:
restart all cards