This geologic feature is the oldest natural park in USA. Geologists study its rock layers to determine the geologic history of Earth. The principle - The laws of nature are always the same - support the findings of the geologists as they studied the rock layers. What is the meaning of this principle?

What are the. principles used to determine the relative age of rock layers?

What are the types of fossil formation?

With the findings on the characteristics of rock layers and the correlation of the fossils to the strata, what tool was invented to determine the age of Earth?