| A | B |
|---|
| atmosphere | Layers of air surrounding the earth |
| atmospheric pressure | Pressure exerted byweight of the gases in the atmosphere |
| aurora borealis | Streamers or bands of light which appear in Northern Hemisphere sky when charged particles excape from the magnetosphere |
| greenhouse effect | Warming of the lower layers of the atmosphere by infrared radiation given off from the earth after it has been heated by the sun |
| heterosphere | Gas layers above the homospherelayers of oxygen, helium, and hydrogen above the earth |
| homosphere | Layer of the atmosphere nearest the earth's surface which consists of a homogeneous mixture of gases |
| jet stream | Path of high speed wind in the stratosphere |
| meteorology | Science of the atmosphere |
| nitrogen | Colorless, odorless, tasteless gas that forms approximately 78% of air by volume |
| oxygen | Cololess, odorless, tasteless gas that forms approximately 21% of air by volume |
| ozone layer | Layer of concentrated ozone located above earth's surface that shields earth from harmful ultrviolet light |
