Making hot rocks was SO much fun! Since we just happened to be doing the rocks and minerals section of our earth science unit, the craft fit in perfectly. The rocks turned out so well, we entered them in the craft division of our co-op’s expo.
Heat rocks in the oven at 350 for 15 minutes. While you wait, peel the paper from several crayon colors. After 15 minutes, you place the crayons on the hot rocks and create your masterpieces.
I placed aluminum foil on the pan, so when the pan came out of the oven, we gathered around it, used old oven mitts to steady the rocks and then we went to town.