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An anyone suggest:
a simple way to define the concept of Ph level as it affects the health of
streams (how do you explain acidic versus basic in just a few words)?
citizen science stream monitoring programs appropriate for kids ages 8-12?
Thanks so much,
Lisa Rudy
Lisa Jo Rudy, Writer/Consultant
625 Chelten Hills Drive
Elkins Park, PA 19027
_www.lisarudy.com_ (http://www.lisarudy.com/)
215-635-9735
_About Guide to Autism_ (http://www.autism.about.com/)
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