Quiz Geologic Time Scale

What process refers to determining the age of rocks?

How is the age of rocks determined using relative dating? (By their ______ within strata)

Identify the principle of stratigraphy being described: "The oldest rocks in the Grand Canyon are at the base." (Principle of_____)

Which principle states that sediments are originally deposited in horizontal layers? (Principle of_____)

Each major layer of sedimentary rock in the Grand Canyon contains different types of fossils. What principle does this illustrate? (Principle of_____)

What characteristic defines an index fossil? (Widespread, ______, and populous)

How is the age of rocks determined using absolute dating? (By measuring the amount of_______)

Which radioactive elements are commonly used in absolute dating? (_____and Uranium-238)

What is the timeline that shows Earth’s formation, changes, and development?

what are the geologic time intervals from largest to smallest?