First 3-volume set is free. Other units in this 244-page booklet include soil, plant, tree and wildlife conservation. Materials were developed with a resource conservation orientation. Worksheet language may be too advanced to be read independently by some 3rd and 4th graders. Additionally, some 3rd and 4th graders may not have the math skills to complete or understand computations included in the materials.
Many activities combine content and study skills.
Includes guide that references activities according to subject area, skill, page number, and topic.