SALT DOUGH
Combine 1 cup of table salt, 1/2 cup of cornstarch, and 3/4 cup of water. Heat the mixture in the top of a double boiler over boiling water, stirring constantly. In about 2 to 3 minutes the mixture thickens and reaches the consistency of unbaked bread dough. Remove from the heat and allow it to cool; then knead for several minutes. Store in an airtight plastic bag. This dough can be used to depict formations. You can put it on any flat surface, such as paper, and it will harden as it dries. My son used it in school when they were studying the land formations of the United States.