Advertisement Upgrade to remove ads


two main gases in atmosphere

nitrogen and oxygen


transfer of energy through space in the form of waves


transfer of heat through atoms colliding


transfer of heat because of density differences; liquid or gas only


closest layer of atmosphere to the earth; where weather occurs


hottest layer of the atmosphere

greenhouse effect

infared radiation remains in Earth's atmosphere


incoming solar radiation

when Earth receives the most energy

when the Sun is directly overhead


brownish haze caused by automobile exhaust

acid rain

pollutants in the water vapor in the air that causes harm to plants, animals, and structures

ozone depletion

increased exposure to ultraviolet radiation

global warming

global temperatures rising caused by human activities and greenhouse gases

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 above and try again


Reload the page to try again!


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

NEW! Voice Recording