
K - 6
Harcourt Health Handbook: Includes diagrams and descriptions of skin, senses, body systems and brain.

Harcourt Health and Fitness Workbooks, grades K - 6
Thunderbolt Kids: Features grades 4 - 6 science and technology lessons that can be viewed online, or you can download here the books (which match the online material and include questions and activities), the teachers' guides (which contain answer keys and teacher notes, and corresponding science adventure comic books.
Mr. Q's Elementary Life Science: 36-week textbook, with separate student and parent editions.
Middle School
Glencoe Teen Health Textbooks
Glencoe Teen Health Workbooks
High School
Holt Lifetime Health: full textbook
Annenberg Learner's The Habitable Planet environmental science textbook.
If anyone knows of any other free textbooks that can be downloaded, please add the links to the comments.
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