Lesson plans are available in books such as in C. Oates-Bockenstedt's "Earth Science Success: 50 Lesson Plans for Grades 6-9," or on Web pages dedicated to sharing teachers' ideas, such as sharemylesson.com, teachervision.com, and discoveryeducation.com. The online sources are often free of charge.
Most online lesson plans are labeled as suitable for a certain age group, such as elementary or middle school students. Plans are available for both theoretical and practical lessons, often supplied with worksheets, games and puzzles. Some sites have materials for a wide array of science lessons, while other sources specialized in more narrow topics, as does geography4kids.com.