Given the question: Read the passage below and choose the right answer to the following question (choices are youngest or oldest ):  Fossils found at the lowest layer of rock would be the oldest, as these would have been buried for the longest time, whereas fossils found closer to the surface would be buried more recently and therefore be younger.   Everett went lower and lower to look at the rocks on the cliff. The highest rocks are likely youngest or oldest?
The answer is:
youngest