Going back in time here a few weeks to the Mesozoic where we studied dinosaurs. We discussed how scientists know dinosaurs existed and had our very own fossil dig:
I made salt dough rocks and when it was still dough took impressions of these plastic dino bones. The corn starch water mixture filled into some of the fossils and made it look pretty authentic. I buried this dough at the bottom of a sand bucket and using paint brushes we brushed away the sand to reveal the fossil imprints.
We read a story about the variety in sizes of dinosaurs by Lita Judge:
and then we ended the class with a little cornstarch, water and baking soda mud play. We used food coloring to represent the minerals in the earth and watched the colors swirl and mix. We put a few plastic dinos into the corn starch mix and watched them disappear into the mud like the La Brea Tar pits.
It was ewey and gooey, but a gooey good time!