Below is information about the student activity/lesson plan from your search.
K-4, 5-8, 9-12
Check out this staightforward lesson, that can be adapted for all grade levels, on how to build a solar oven.
Science, Visual Arts, Language Arts
One class period
One pizza box from a local pizza delivery store, tape, scissors, black construction paper, clear plastic wrap, aluminum foil, a piece of notebook paper, a pencil or pen, a ruler or a wooden dowel or a stick.