instruction:
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.
question:
Question: What delivers natural gas from rock that might not otherwise be obtainable? Answer: fracking
answer:
Fracking delivers natural gas from rock that might not otherwise be obtainable.


question:
Question: What is the amount of product that may be produced by a reaction under specified conditions called? Answer: theoretical yield
answer:
The amount of product that may be produced by a reaction under specified conditions is called theoretical yield.


question:
Question: Similarity of crystal structures is used to categorize what non-living materials? Answer: minerals
answer:

Similarity of crystal structures is used to categorize minerals non-living materials.