www.middleschoolscience.net 

  Chemistry, Elements, Minerals, Gemstones
www.chem4kids.com (Periodic Table & Elements)
www.webelements.com (Web Elements Periodical Table)
www.gemstone.org/ (Internat'l Colored Gemstone Assoc.)
www.theimage.com/ (Mineral & Gemstone Gallery)
www.minerals.net (Mineral and Gemstone Kingdom)
www.chemicol.com  (Training Solutions for the Chemical Industry)
www.chemicalelements.com  (Online, Interactive Periodic Table of the Elements)

   Biomes, Endangered Species, the Environment  
www.mbgnet.net (Missouri Botanical Garden: Biomes of the World)
www.enchantedlearning.com (animal printouts, biomes, habitats, astronomy,and more...)
www.oncampus.richmond.edu/academics/education/projects/webunits/biomes (Biome Basics)
www.blueplanetbiomes.org (Blue Planet Biomes)
www.sierraclub.org/ecoregions/ (Sierra Club)
www.ucmp.berkeley.edu/glossary/gloss5/biome (The World's Biomes)
www.cyberfair.gsn.org/tenan/indexusa.htm (Endangered Animals of the World)
www.fsw.gov/endangered (U. S. Fish & Wildlife Service Endangered Species Program)
www.eelink.net/EndSpp/  (Endangered Species)
www.earthforce.org  (Earth Force)
www.kidsagainstpollution.org  (Kids Against Pollution)
www.nwf.org  (National Wildlife Federation)
www.worldwildlife.org  (World Wildlife Fund)

    National Parks
www.us-national-parks.net (U. S. National Parks)
www.nps.gov (National Park Service)
www.kaibab.org (Grand Canyon Explorer)
www.llbean.com (go to Outdoors Online, Park Search)

     Viruses and Germs
www.virology.net/Big_Virology/BVHomePage.html (Big Picture Book of Viruses)
www.bam.gov  (Body and Mind: Centers for Disease Control & Prevention)
www.cdc.gov  (Centers for Disease Control & Prevention)
www.kidshealth.org  (Kids Health)

     Simple Machines       
www.sciencetech.technomuses.ca/english/schoolzone/Info_Simple_Machines2.cfm (Simple Machines)
www.teacher.scholastic.com/dirtrep/simple/ (Simple Machines)
www.ed.uri.edu:80/SMART96/ELEMSC/SMARTmachines/machine.html (Marvelous Machines)
www.mos.org/sln/Leonardo/InventorsToolbox.html (Elements of Machines: Simple Machines)
www.fi.edu/qa97/spotlight3/spotlight3.html (Spotlighting Simple Machines)
www.learner.org/exhibits/parkphysics/index.html  (Amusement Park Physics)

     Astronomy
www.seds.org (The Nine Planets)
www.windows.ucar.edu (Windows to the Universe)
http://pds.jpl.nasa.gov/planets/ (Welcome to the Planets)
http://spaceplace.jpl.nasa.gov/en/kids/projects.shtml (Starfinder)

    Volcanoes & Earthquakes
http://volcano.und.nodak.edu (Volcano World)
www.geol.ucsb.edu/~fisher/ (Volcano Information Center)
www.geo.mtu.edu/volcanoes/world.html (Earth's Active Volcanoes)
www.volcano.si.edu/gvp (Global Volcanism Program: Smithsonian)
http://earthquake.usgs.gov/4kids/ (U. S. Geological Survey: Earthquakes)
www.howstuffworks.com/earthquake.htm (How Earthquakes Work)
www.pbs.org/wnet/savagearth/ (Savage Earth: volcanoes, earthquakes, tsunamis)

    Scientist Biographies
www.ziplink.net/~pik/Famous%20Scientists.html
www.blupete.com/Literature/Biographies/Science/Scients.htm
www.th.physik.uni-frankfurt.de/%7Ejr/portraits.html
http://crux.astr.ua.edu/4000ws/4000WS.html
http://scienceworld.wolfram.com/biography/
www.brgt.net/