Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

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.
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
remaining cards
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

rocks weathering

uniformitarianism the geological principle that the same processes that operate today operated in the past to change earth's surface
erosion the processes of wearing down and carrying away rocks
weathering is the processes that breaks down rocks and other substaince
mechanical weathering a type of weathering where rock is physically broken
chemical weathering is the processes that breaks down rock through chemical changes
abrasion wearing away rock by particles carried by water ice wind or gravity
frost wedging water freezes in rocks and expands then forces rocks apart
oxidation iron combines with oxygen in the presence of water causing rust
permeable a material that is full of tiny connected air spaces that allows water to seep through it
soil the loose weathered material on earth surface in which plants grow
bedrock rock that makes up earths crust also the solid rock layer beneath the soil
humus dark colored organic material in soil
fertility a measure on how well soil supports the plant growth
loam rich fertile soil that is made up of about equal parts of clay sand and silt
ph scale a range of values used to indicate how acidic or basic substances
soil horizon a layer o soil that differs in color and texture from the layers above or below it
top soil the crumbly topmost layer of soil made up of clay and other minerals and humans
sub soil the layer of soil below topsoil that has less plant and animal matter than topsoil
decomposer an organism that gets energy by breaking down waste and dead organisms and return raw matrials to the soil and water
natural resource is anything in the environment that humans use
soil conservation is the management of soil to limit its destruction
contour plowing farmers plow their fields along the curves of a slope instead in straight lines
crop rotation a farmer plants different crop each year
conservation plowing dead wheat and stalks of the previous year
Created by: jmg11941