What did the rock study?
How do scientists use fossils to tell them how the earth has change over millions of years of history?
Question is not stated properly. What it seems to be asking is the relationship between rocks and Geology. Rocks are basically what the Earth is made of...you have tiny tiny rocks....great big giant rocks....melted rock. Everything that is not water or air is rock and is therefore a part of the study of the Earth...that we call Geology.