In this task, you are given a question and an answer, you would be asked to create the sentence based on the Question-Answer provided. It should be contained within the Question-Answer provided.

[EX Q]: Question: Which crust lies deep inside the ocean? Answer: oldest
[EX A]: Oldest crust lies deep inside the ocean.

[EX Q]: Question: Which model can be used to trace genetic inheritance? Answer: pedigree chart
[EX A]: The pedigree chart model can be used to trace genetic inheritance.

[EX Q]: Question: Gabbro is a dark dense rock that can be found in what? Answer: oceanic crust
[EX A]:
Gabbro is a dark dense rock that can be found in the oceanic crust.