(Sample link) NASA for middle-school students http://www.nasa.gov/audience/forstudents/5-8/features/index.html
How's the Weather 7th grade atmosphere http://scijinks.jpl.nasa.gov/weather/howwhy/planets/index.shtml
Noaa Weather http//www.nws.noaa.gov/
Nasa Oceans Salinity Studies http://science.hq.nasa.gov/oceans/physical/SSS.html
Missouri Trees Tree ID
Bluebirds for study Bluebirds