American Chemical Society
Middle School Chemistry: Chapter 3: Density
Six interactive chemistry lessons about density complete with handouts and animations.
Other
Food and Water Watch: Factory Farm Map
A United States map showing density levels of animals raised for food, accompanied by effects of factory farming and latest news on farming, animal welfare and food safety.
Chiral Publishing
Chiral Publishing: An Introduction to Chemistry: Density and Density Calculations: Audio Book
This audio book, narrated by author Mark Bishop, describes how to calculate density. The equation is given. Also find links to animations and tutorials for other sections of the online textbook, "An Introduction to Chemistry".
My Science Site
Life Systems: Cells, Tissues, Organs
Extensive site for teachers provides some helpful resources that pertain to plant and animal cells. Includes a microscope diagram as well as plant, animal and pond labs. Also contains links to structures and mechanisms, matter and...
Khan Academy
Khan Academy: Genesis Effect
Using the interactive tool, see what kind of looks you can achieve with this Genesis effect inspired simulator.