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
edit
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 7

Unit 7 Earth's history

TermDefinition
1. Uniformitarianism a principle that geologic processes that occured in the past can be explained by current geologic processes
2. Fossil the trace or remains of an organism that lived long ago, most commonly preserved in sedimentary rock
3. Trace fossil a fossilized structure, such as a footprint or a coprolite, that formed in sedimentary rock by animal activity on or within soft sediment
4. Climate the weather conditions in an area over a long period of time
5. Ice core a long cylinder of ice obtained from drilling through ice caps or ice sheets: used to study past climates
6. Relative dating any method of determining whether an event or object is older r younger than other events or objects
7. Superposition a principle that states that younger rocks lie above olders rocks if the layers have not been disturbed
8. Unconformity a break in the geologic record created when rock layers are eroded or when sediment is not deposited for a long period of time
9. Geologic column an ordered arrangment of rock layers that is based on the relative ages of the rocks and in which the oldest rocks are at the bottom
10. Absoulute dating any method of measuring the age of an event or object in years
11. Radioactive decay the process in which a radioactive isotope tends to break down into a stable isotope of the same element or another element
12. Half-life the time required for a half of a sample of a radioactive isotope to break down by radioactive decay to form a daughter isotope
13. Radiometric dating a method of determining the absolute age of an object by comparing the relative percentages of a radioactive parent isotope and a stable daughter isotope
14
Created by: Tyler Tj
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