1/4 cup of plaster of Paris
1 Cup of Vermiculite (found at gardening center)
1/2 cup of water Measure and mix together.
Put some in the bottom of a regular size paper cup. Fill about 1/4 full. Next, they put in a small plastic or rubber dinosaur. Then the fun: the children bury their dinosaur completely. Don't let any part of him remain uncovered!! Set aside for 2
References / Source:
Kathy, Hiawatha Council