An incredibly thorough site with a wealth of basic information on oxygen. Highly recommended.

Very nice site with a great deal of excellent and helpful information on oxygen.

Why do we care about air? Breathe in, breathe out, breathe in... most, if not all, humans do this automatically. Do we really know what is in the air we breathe? In this activity, students use M&M(TM) candies to create pie graphs that show their understanding of the composition of air. They discuss why knowing this information is important to engineers and how engineers use this information to improve technology to better care for our planet.

An explanation of how shock, oxygen delivery, and metabolism are related.

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Video talks about the carbon cycle and uses a computer as a metaphor to show how the cycle can be disrupted by climate change. [3:55] Includes a short quiz and a list of additional resources to explore.