OZONE POLLUTION BY WILDFIRES

Wildfires are one of the things that gives a lot of pollution to the ozone layer, and affect peoples health. Scientists say that wildfires happened repeatedly and caused many people to be unhealthy in the area. Also, scientists found that when the ozone levels reach at a high rate, you can see smoke in places where you wouldn't normally see it. Researchers use computers models and measurements to pin point huge wildfires in California. As the ozone layer is blocking rays from the sun, it can cause many health problems because it is in the lower atmosphere. The ozone levels that is unhealthy were detected in rural areas. Therefore, if you see a fire in the woods, PUT IT OUT.
http://www.nsf.gov/news/news_summ.jsp?cntn_id=112403&govDel=USNSF_51

Comets

Comets have been around for a very long time, even way back to 240 BC. Comets are sometimes called dirty snowballs, it's a mixture of ice and dust. Also, you can only see comets when they are near the sun. Many people say that Comet Halley is a famous comet and that's because it's true. Sometimes, we might have meteor showers only if the Earth goes through the orbit of a comet. Most, comets are discovered by astronomers. Finally, comets are an interesting thing and should be shown to everyone in the world.