Create an account
a heavy odorless colorless gas formed during respiration and by the decomposition of organic substances
(medicine) the treatment of disease (especially cancer) by exposure to radiation from a radioactive substance
Natural cycles in the Earths position (changes in orbit, axis tilt and precession) that are used to explain climate changes over the last 400,000 yrs.
the regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist
coal or charcol, an abundant nonmetallic tetravalent element occurring in three allotropic forms: amorphous carbon and graphite and diamond
water that falls from the atmosphere to the Earth as rain,sleet , or snow, overly eager speed (and possible carelessness)
Gases such as carbon dioxide, methane, nitrous oxide, water vapor, and ozone in the atmosphere which are involved in the greenhouse effect.
Please allow access to your computer’s microphone to use Voice Recording.
Having trouble? Click here for help.
We can’t access your microphone!
Click the icon above to update your browser permissions and try again
Reload the page to try again!Reload
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Please upgrade Flash or install Chrome
to use Voice Recording.
For more help, see our troubleshooting page.
Your microphone is muted
For help fixing this issue, see this FAQ.
Star this term
You can study starred terms together