It has an attractive texture and colour and it can be cut ... Make a list of all the different rocks you saw. Can you think of ways to group and compare the rocks you saw?

But a rock found deep in a limestone cave in Oklahoma is extending our understanding of prehistoric skin. The texture preserved ... don't know about how the various traits of different animal ...

The art of creating an African rock garden lies in balance, not symmetry. It's a dance of rocks, plants, soil, and water ...