Ans.) The study of rock layers and fossils are a great way of interpreting how the earth has endured, changed and adapted during the transformation and so many weather changes. The study is integral as it indicates the relative age of the rock layers and fossils which can be helpful in also determining the age of the earth and its movements during a particular era in its history. Stratification and its result of rock strata formation is a piece of physical evidence that helps you decipher the history of our planet Earth. The law of original horizontality according to Steno’s Laws states that most sediments were laid down horizontally originally. However, many-layered rocks are no longer horizontal according to recent evidence which can be undeniably interpreted as that Earth has adapted to new changes and a new geologic age has begun that can be studied.