Week 4 of this independent study packet for third graders brings on new challenges in various subjects.

Did you know there are 6 simple machines that make up every complicated gizmo out there? This book introduces the pulley, the lever, the screw, the wedge, the inclined plane and the wheel & axle.

The activities in this workbook do double-duty as both vocabulary practice and earth science review with a collection of word scrambles, crosswords, and quizzes about animals, plants and planets.