The National Geographic Resource Library is a vast cornucopia of encycloedia entries, infographics, collections, maps, photographs, etc that can be filtered by grade level. By limiting your choice to “articles”, one calls up encyclopedia entries on a vast number of scientific topics; each entry has links to explain terminology/definitions and most end with linked further reading, whether from newspaper article, government site, or verified websites.
Easy to navigate and pleasing on the eye, this site offers a wealth of information distilled into very understandable presentations. A lot of work was done to put this resource together; one should take advantage of it.
Congressman Frank J. Guarini Library Blog 
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