Science
Physical Science
Simple Machines
NeoK12 has activites and videos about simple machines, including a Bill Nye the Science Guy video. You have to register, but the website is free. They also have videos, games, and worksheets for many other science topics.
The Museum of Science in Boston has pages that describe simple machines, including a Gadget Anatomy page where you can learn which simple machines are used in some common devices.
Simple Machines for Kids is a website offered by AppliancePartsPros.com. It has lots of links for lesson plans for learning about simple machines.
Simple Machine Unit by Cindy Downes - Cindy Downes has a unit about simple machines for primary grades.
Sound
Discovery Education has a unit study about sound waves.
The Physics Classroom has a unit about sound for older students.
BBC Schools Science Clips has interactive games for younger students about sound and hearing.
Light
Facts About Light - GE Lighting has a list of facts about the light spectrum, the speed of light, and the properties of light.
GE Lighting also has lessons about light. The lessons include activities such as separating light with a prism, making a pinhole camera, bending light, and reflecting light.
NeoK12 has short video clips about light.
Electricity
Learning Workroom LLC has a blog called Learning Ideas - Grades K-8 that features a different theme each month. The theme for January 2011 is Energy. The blog has instructions for experiments that students in grades K-8 can do to learn about electricity, along with links for a wordsearch and a video about electric circuits.
Physics
Bozemanscience.com has a playlist of videos for physics on its Youtube channel. These were created by Paul Andersen.
The Physics Classroom an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics principles discussed in a first-year high school physics course. There are sample problems and solutions on this site.
HippoCampus offers a physics class online. The animated presentations make the lessons very interesting, even for younger students.
Massachusetts Institute of Technology has Prof. Walter Lewin's Physics lectures on YouTube.
Nova has a page called Physics of Stone Arches to go with their show, Building the Great Cathedrals. The page has a link to a fun interactive activity in which you can try to build a cathedral arch without it collapsing while you learn more about the forces at work in contructing an arch.
Chemistry
The Periodic Table of Videos, offered by the University of Nottingham, has links to videos about each of the elements. These are fun!
The Periodic Table is an interactive unit for grades 9-12 offered by Interactives.
Balancing Chemical Equations - Jefferson Lab has an interactive page on its site for balancing chemical equations.
Sciencebob.com is a fun site that has videos of science experiments that you can do at home. The site also has ideas for science experiments, a question and answer section, and links to other sites.
Apologia Physical Science
Links for Quia and Quizlet flashcards for Apologia Education Ministries' Exploring Creation with Physical Science by Dr. Jay L. Wile
Home Schooler's Resources is a blog that has links to Youtube videos that help explain the topics presented in each module of Apologia's Physical Science course. It also has links for Apologia's Biology course and many other subjects.
Life Science
General Biology
HippoCampus has free biology classes online. You can choose a textbook, and then watch an audiovisual presentation about each topic. The animations make the lessons very interesting.
The University of California, Berkeley has videos of its General Biology 1A course online.
Apologia Biology
Links for crossword puzzles and flashcards for Apologia Education Ministries' Exploring Creation with Biology (2nd edition) by Dr. Jay Wile and Marilyn F. Durnell
Quizlet has flashcards for Apologia's Exploring Creation with Biology. I like Quizlet, because you can print flashcards for the vocabulary words.
Home Schooler's Resources is a blog that has links to Youtube videos that help explain the topics presented in each module of Apologia's Biology course. It also has links for Apologia's Physical Science course and many other subjects.
Cells
Interactive cell structure - Wiley has an interactive unit that teaches about prokaryote, animal, and plant cells.
NeoK12 has short instructional videos about cells online.
All About Science has a video clip from Unlocking the Mysteries of Life which shows an animation of DNA replication.
Cells Alive! has interactive models of cells.
Nancy Clark, a retired science teacher, has a page on her website about cells which includes experiments, activities, crossword puzzles, and lots of other links about cells.
Crayola has a coloring page for labeling the parts of a cell.
Animals
National Geographic has interesting videos and articles online about many different animals.
Enchanted Learning has pictures to color and label, articles to read, forms for making reports, and many other resources. You can access the website for free, but if you pay the $20 yearly subscription fee, you can print pages without ads.
All About Birds is an online guide to birds and bird watching that is offered by Cornell University. This site is packed with information about birds! If you look up a bird, you can also listen to a recording of a typical bird song for that type of bird.
Plants
The Arbor Day Foundation has an interactive website for learning about trees.
The Wisconsin Department of Natural Resources also has a website for tree and shrub identification. The Beginner's Tree Identification page is especially helpful for identifying trees and shrubs in the Wisconsin area.
BBC has a game for learning the parts of a flower. You click on each part of the flower, and drag it into the box with the correct name on it.
Anatomy and Physiology
Quia flashcards for learning the names of the bones of the skeleton
GetBodySmart.com has interactive animations for learning about the human body.
Vitamins and Minerals - The Open University has free online course about vitamins and minerals.
The Digestive System - This is a link to a Quia game about the digestive system. Match the name of the digestive organ to the correct number on the picture.
Crossword puzzle for Joanna Cole's The Magic School Bus Inside the Human Body
Earth Science
Astronomy
NASA has a website about astronomy called StarChild: A Learning Center for Young Astronomers. The site is offered at two different reading levels.
Learning Workroom LLC has a blog called Learning Ideas - Grades K-8 that features a different theme each month. The theme for December 2010 is The Solar System. The blog has activities that students in grades K-8 can do to learn about the Solar System.
Snowflakes
SnowCrystals.com has lots of information about snowflakes, and beautiful photos of snowflakes. There is also a page with instructions on how to make paper snowflakes that look like real six-sided snowflakes.
Clouds
Web Weather for Kids has activities and games for learning about different cloud formations.
Cloud Quiz - Quizlet has online flashcards for the different types of clouds.
Rocks
The Rock Cycle is an interactive website by Interactives about rocks that has lessons about the three main types of rock, how to tell the different rock types apart, and how rocks change from one type into another.
NeoK12 has videos and quizzes about identifying rocks, the rock cycle, and the different types of rocks.