| 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 |
| air pressure | pressure exerted by the air in a particular area |
| UV radiation | direct radiation by the sun - harmful to living things |
| atmosphere | an envelope of gases surrounding the earth that extends about 1000 Km above the surface |
| thermosphere | the topmost layer of the atmosphere - the highest temperatures occur in this layer |
| 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 |
| smog | air pollution caused by use of fossil fuels, factories |
| 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 the stratosphere protecting the earth from UV radiation |
| aurora borealis | northern lights - caused by solar winds |
| nitrogen | 78% of the atmosphere is this gas |
| oxygen | only 21% of the atmosphere is this gas |
| phytoplankton | tiny plants which have made most of the oxygen in our atmopshere |
| carbon dioxide, argon, water vapor | trace gases found in our atmopshere |
| weather | all of this occurs in the troposphere |
