Alternative Energy and Conservation:

• Rocky Mountain Institute

Rocky Mountain Institute is an entrepreneurial nonprofit organization that fosters the efficient and restorative use of resources to make the world secure, just, prosperous, and life-sustaining.

• EERE Energy Education and Training: Energy Lesson Plans ...

US Department of Energy Energy Efficiency and Renewable Energy

• Alternative Energy, Windmill and Solar Project List

• Energy Education Curriculum Program

Texas State Energy Conservation Office

• California Energy Commission (CEC)

• National Renewable Energy Laboratory (NREL)

• Consumer Energy Center

• Buckminster Fuller Institute (BFI)

• Solar Energy Institute: Links

• Real Goods

Animals:

• African Primates at Home
  • Pictures, sound, and information about several species of African monkeys and apes
• African Wildlife Foundation Wildlife Pages
  • Select from a list of animals of Africa.
• Animal Bytes
  • Information and fun facts about animals of the world. 
• National Zoo
  
• Living Africa
  • Click on Wildlife for African animals
• Animal Search
  • Search for a specific animal, or browse by animal type or group, organizations related to animals or geographical regions.

Biomes:

• Evergreen Project - 6 Biomes
  • This excellent site explores locations, plants, animals, and features of 6 biomes: rainforests (including our North American rainforest), tundra, taiga, desert, temperate forests, and grasslands
• EPA Office of Water: Wetlands
  • Great source of information on watersheds and wetlands, this site covers economic issues, and the toxic waste releases by local companies.  Watersheds searchable by zip code.
• Major Biomes of the World
  • Information on tundra, taiga, deciduous forests, rainforests, savanna, grasslands, desertscrub and more.  Climate, vegetation, fauna as well.

Cells:

• Cells Alive
  • Plant and animal cells, models, mitosis and more.
• Biology of the Cell
  • Definitions and illustrations of cells and parts of cells.
• Filamentality Hotlist on Cancer
  • Directory of sites on cancer  and abnormal cells.

Chemistry:

• Chemical Elements.com
  • Periodic Table with excellent chart of atomic structure.
• Periodic Table of Elements
  • Excellent site from Los Alamos National Laboratories.
• Wooden Periodic Table
  • This unique Periodic Table includes photos and great links to other element sites.
• Chem4Kids

  Great site for atoms, elements, matter and more.
• 3-D Animated Molecules

Earthquakes:

• National Earthquake Information Center 
• Advanced National Seismic System
  

Enrichment:

• Franklin's Forecast
  • Learn to build your own weather station or try weather activities.
• What's That Stuff
  • What is Silly Putty made of?  Inquiring minds find out here.
• Virtual Cave
  • Take a virtual spelunking trip.
• Yuckiest Site 
  • Visit the yuckiest site on the Internet, learn about disgusting science facts and play some revolting games.
• Mad Labs
  • Fun from MadSci.org.  Try the Edible Experiments or the Random Knowledge Generator.
• Science Learning Network
  • Click on Our Resources for features about everything from the science of hockey to a cow eye dissection.

• Optics: Powers of 10
• Subliminal Messages

Environment:

• EPA Student Center
  • The Environmental Protection Agency's student web page.
• Oil Spills
  • National Oceanic and Atmospheric Administration's Oil Spill page for kids.
• Acid Rain
  • The EPA's Acid Rain information page.
• Keep America Beautiful
  • Basic information on littering and how you can help prevent it.
• Litter Brochure
  • Why people litter, the cost of littering, prevention ideas (an acrobat reader file)
• Water Pollution
  • The EduGreen website reviews water pollution, oil spills, water cycle, statistics on fresh water and strategies for reducing water pollution.
• Union of Concerned Scientists
  

Genetics:

• Genetic Disorders
  • This is a hotlist of sites with information on genetic disorders.
• DNA Learning Center
  • A primer on the basics of DNA, genetics and heredity. Cool animations.
• Web MD Diseases
  • Alphabetic list of diseases and conditions by a leading online medical source.
• Medline Plus - Genetics
  • Genetics and Birth Defects topics
• Mayo Clinic
  • Diseases and Conditions A-Z listing

Matter:

• What is Matter?
  • Physical and chemical changes, chemical reactions, mixtures.

Scientists and Inventors:

• The Biographical Dictionary
  • Search by birth or death year, profession, achievements and keyword.
• Distinguished Women of Past & Present
  • Search by name or subject for biographies of women.
• MIT's Inventor of the Week Archives
  • Inventor biographies.
• The National Inventors Hall of Fame
  • Biographies of inventors listed in the Inventors Hall of Fame.
• The National Women's Hall of Fame
  • Search here for famous women scientists.
• 4000 Years of Women in Science
  • Search this list of 125 women scientists.
• Scientists and Thinkers Timeline
  • Timeline
• Black Inventors Timeline
  • Timeline
• Historical Women in Science
  • Timeline

Science Reference:

• Ask a Scientist
  • Choose a topic and find answers to science questions.
• Cornell Math and Science Gateway
  • An excellent directory to science and math resources.
• How Stuff Works
  • This website is dedicated to explaining how “stuff” works.
• Why Files
  • Check out the "science behind the news" features or search the list of topics.
• Conversion Factors
  • Handy conversion factors for US units to International System units.
• Franklin Institute Online
  • Visit this amazing online museum.  Explore the exhibits or check the extensive list of Internet resources.

Trees:

• What is Photosynthesis
  • A list of links to sites about photosynthesis.
• Biological Energy
  • Photosynthesis and food webs.