Longman Earth Science Part 1
(lessons 1 & 2)
Homemade play dough
In a medium sauce pan combine 1 cup flour, 1 cup water, 2 teaspoons cream of tartar, 1/3 cup salt, 1 tablespoon vegetable oil. Cook, stirring constantly until a thick ball of dough forms. Dough should pull away from the pan sides. Remove from heat. Kneed in food coloring.
3-D Model of the Earth's Layers
(using sectional diagrams)