Busy. Please wait.

Forgot Password?

Don't have an account?  Sign up 

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.

By signing up, I agree to StudyStack's Terms of Service and Privacy Policy.

Already a StudyStack user? Log In

Reset Password
Enter the email address associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know (0)
Know (0)
remaining cards (0)
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:
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

Science Q3 Sief

Bedrock The bottom layer of soil, made mostly of soild rock
Topsoil The top layer of soil, made in part from broken pieces of lower layers of rock
Physical weathering caused by wind, water, plants, and ice
Chemical weathering It occurs when chemicals break up rocks by dissolving parts of them
Fossils: Any naturally preserved evidence of past life
Mold: An impression of an organism formed when sediment hardens around the organism .
Cast: A fossil of an organism formed when sediment fills a mold and hardens.
Fossil fuel: An energy-­‐rich resource formed from the buried remains of once-­‐living organisms.
Index fossil: A fossil of a type of organism that lived in many places during a relatively short time span.
Mass extinction: A period during which a large number of species become extinct.
Created by: mohamedelhussien