| A | B |
|---|
| photosynthesis | process by which plants use energy from sunlight to make sugar |
| glucose | a kind of sugar occuring in plants & animals |
| water vapor | water in a gaseous state |
| nitrogen cycle | closed cycle of nitrogen's use from removal from air to be used by organisms, then returned to the air |
| oxygen-carbon dioxide cycle | closed cycle use of oxygen, from carbon move thru the atmosphere to release by plants & green algae |
| nitrogen fixation | part of N cycle where N is removed from the air to combine w/ other elements forming N compounds |
| air pressure | pressure exerted by the air in a particular area |
| conduction | a type of heat transfer by electrons between objects by direct contact |
| convection | a type of heat transfer from warm to cool areas in a circular flow |
| UV radiation | direct radiation by the sun |
| Spf-15/24/30 | amount of sun protection screen to block UV radiation |
| atmosphere | an envelope of gases surrounding the earth that extends about 1000 Km above the surface |
| exosphere | outermost layer of the atmosphere that extends several thousands Km's above the earth |
| thermosphere | layer of the atmosphere right below the exosphere |
| mesosphere | middle layer that extends from the edge of stratosphere to about 65KM's |
| stratosphere | layer of the atmosphere that contains the ozone layer |
| troposphere | life containing layer of the atmosphere that is closeth to the earth |
| ionosphere | layer of air between the mesosphere & thermosphere where radio waves & light signals are reflected back to earth |
| magnetosphere | an area in the thermosphere where solar particles are trapped & contain charged particles called VAN ALLEN radiation belts |
| blackout zone | a zone around a spaceship that is ionized & prevents radio signals from reaching it |
| smog | air pollution caused by use of fossil fuels, factories |
| gray air | occurs in colder moist climates & produces a grayish haze |
| brown air | occurs in warm dry sunny climates produced by photo-chemical smog |
| greenhouse effect | the warming of the atmosphere due to the trapping of heat from the sun by carbon dioxide & other gases |
| ozone | gases that form in thestratosphere protecting the earth from UV radiation |
| ozone depletion | chlorfluorcarbons released by aerosols cans & air conditioners break down the layer of ozone |
