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

es earth's history

boy wtf

TermDefinition
uniformitarianism the physical, chemical, and biological laws that operate today have also operated in the geologic past.
relative dating tells us the sequence in which events occurred. not how long ago they occurred.
law of superposition in an undeformed sequence of sedimentary rocks, each layer is older than the one above it and younger than the one below it.
principle of original horizontality layers of sediment are generally deposited in a horizontal position.
principle of cross-cutting relationships when a fault cuts through rock layers, or when magma intrudes other rocks and hardens, then the fault or intrusion is younger than the rocks around it.
inclusions rocks contained within other rocks. rocks containing inclusions are younger than the inclusions they contain.
unconformities A surface that represents a break in the rock record. deposition stopped, erosion removed previously formed rocks and then deposition resumed.
angular unconformity indicates pause in deposition, a period of deformation (folding or tilting) and erosion occurred.
disconformities when the erosional surface separates older metamorphic or intrusive igneous rocks from younger sedimentary rocks.
index fossils widespread geographically, are limited to a short span of geologic time and occur in large numbers
half-life the amount of time necessary for one half of the nuclei in a sample to decay to its stable isotope.
radioactivity the process by which atoms decay.
radiometric dating a way of calculating the absolute ages of rocks and minerals that contain certain radioactive isotopes.
radiocarbon dating a method to date organic materials using carbon-14.
When an organism dies, the amount of carbon-14 gradually decreases
eons largest intervals of geologic time
eons are divided into eras
each era is subdivided into periods
periods are divided into smaller units called epochs
Created by: jaidynsimon
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