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Subject is Chemical elements
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View Resource What Goes Around Comes Around: Nitrogen Cycle

This free, standards-based, online publication, developed for middle school science teachers, explores nitrogen. As with the water and carbon cycles, the nitrogen cycle does not fit neatly into a...

http://wiki.nsdl.org/index.php/MSP:MiddleSchoolPortal/What_G...
View Resource International Year of Chemistry

Through the Year, the world will celebrate the art and science of chemistry, and its essential contributions to knowledge, to environmental protection, to improvement of health, and to economic...

http://www.chemistry2011.org/
View Resource The UNESCO Courier: Chemistry and Life

A free online journal for The International Year of Chemistry, 2011.

http://unesdoc.unesco.org/images/0019/001906/190645e.pdf
View Resource Complete Listing of NAWQA’s Study Units and Summary Reports

Reports on the top 52 US water drainages between 1990 and 2001. E-circulars include surface water, ground water, urban effects, and topics such as fish and algae.

http://water.usgs.gov/nawqa/studies/study_units_listing.html
View Resource National Water Quality Assessment Data Warehouse (NAWQA)

Chemical, biological, and physical water quality data from a study of 42 watershed basins.

http://infotrek.er.usgs.gov/apex/f?p=NAWQA:HOME:0
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