For Further Research:
- Contact your local air pollution authority or the U.S. Environmental Protection Agency for additional information about the air quality in your community.
| volcanic eruptions, and a variety of other sources including meteorites and comets. Every day, about 100 tons of meteorite and comet dust falls to Earth from space. Over-all, dust particles scatter some of the light that comes through the atmosphere from space. Note: Due to wide variations in air quality, it is recommended that this experi-ment be pre-tested in the school neighbor-hood to learn how long to expose the sam-pler. The time period may have to be extended to several days to show measureable results. Although the collector will probably collect particles of extraterrestial origin, telling which particles |
are extraterrestial will require analytical
techniques beyond the scope of this guide. For Further Research:
|
