Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


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.

Remove Ads
Don't know
Know
remaining cards
Save
0:01
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:
Retries:
restart all cards




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

18.4 terms

TermDefinition
ammonification the formation of ammonia compounds in the soil by the action of bacteria on decaying matter
biogeochemical cycle the circulation of substances through living organisms from or to the environment
carbon cycle the movement of carbon from the nonliving environment into living things and back
denitrification the liberation of nitrogen from nitrogen-containing compounds by bacteria in the soil
groundwater the water that is beneath the earth's surface
nitrogen cycle the process in which nitrogen circulates among the air, soil, water, plants, and animals in an ecosystem
nitrogen fixation the process by which gaseous nitrogen is converted into nitrates, compounds that organisms can use to make amino acids and other nitrogen containing organic molecules
nitrogen-fixing bacteria a bacterium that converts atmospheric nitrogen into ammonia
phosphorus cycle the cyclic movement of phosphorus in different chemical forms from the environment to organisms and then back to the environment
transpiration the process by which plants release water vapor through stomata; also the release of water vapor into the air by other organisms
nitrification nitrites and nitrates are produced by bacteria in soil
water cycle the continuous movement of water between the atmosphere, the land, and the oceans
Created by: Addaleigh