The Role of Oxygen in the Atmosphere

Explain how oxygen became part of our atmosphere and the various ways it makes life possible on Earth. You need to answer fully in 2 to 3 complete sentences.

Climate Change - What is the Cause?

Climate change is a fact of life that all citizens of the world must face. The evidence is overwhelming that temperatures are increasing world-wide, despite denials from vested interests. The real question is how much human activities are influencing the situations. After reading the article about climate change facts, what is your opinion? Support it with facts from the article.

Rick's First Entry

<iframe src="http://player.vimeo.com/video/2579445?title=0&amp;byline=0&amp;portrait=0" width="400" height="300" frameborder="0"></iframe><p><a href="http://vimeo.com/2579445%22%3ECanoe - Sampling Eastern Lake</a> from <a href="http://vimeo.com/wholeo%22%3ECaroling Wholeo</a> on <a href="http://vimeo.com%22%3evimeo%3c/a%3E.%3C/p>