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Physical sciences  
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The basic chemistry of water, along with a brief glimpse into water's origin on Earth, are discussed in this two page article. The article can be used as a "reading to be informed" activity in a stand-alone fashion or can be incorporated into a... (View More)

Keywords: Water chemistry
Audience: Middle school, High school, Informal education
Materials Cost: Free

This article explains how Earth's atmosphere scatters the light from the sun, thereby creating the blue color we typically associate with our sky. Supplementing this article is an explanation of the importance of scattering sunlight. The article is... (View More)

Audience: Informal education
Materials Cost: Free