Check your answer Q8 . Consider three undeformed horizontal beds of sedimentary rock. The layer on top is the oldest. The middle layer is the oldest. The layer on the bottom is the oldest.
More information is needed to determine which layer is oldest.
Check your answer Q9 . A rock formed with 1,000 atoms of a radioactive parent element, but contains only 250 radioactive parent atoms today. 2 million years old Check your answer Q10 . That's the end of the quiz. You can either go back to the quiz page and select a new topic, or go back to the first question in this page and review again.