|MadSci Network: Earth Sciences|
Ashley, All you need to use is some sand or small rocks and something to hold it all together. You will have to experiment a bit to figure out how much of each material to use. If you want hard rocks use (cooking) flour with moistened sand. You might also try using glue with sand. I suggest that you try using any of the unflavored gelatin products (from the grocery store) with moistened sand. The resulting 'rocks' will not be too difficult to work with. If you use the flavored "Jello" products you can make rocks of different colors - BUT be careful because the colors might stain clothing and other items. These combinations are water soluble (you may have to use hot water) so you will be able to clean up after your Dinosaur Dig. John Haberman
Try the links in the MadSci Library for more information on Earth Sciences.