Some examples include shell prints, leaf prints, or animal tracks. Fossils give us evidence about the plants and animals that lived long ago, and the nature of the environment at that time. Pumice is an igneous rock. It was thrown into the air as lava from a volcano. Pass around a piece of pumice.
Slate is an example of a metamorphic rock.
Have the children take turns putting a few drops of vinegar on each rock. The limestone should bubble. Explain that you can see layers in sedimentary rocks. Another child can stir this with a spoon. They have small mineral pieces because they cooled quickly.