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: What is formed when a subducting plate flows under another tectonic plate? Answer: volcanic arc
[EX A]: A volcanic arc is formed when a subducting plate flows under another tectonic plate.

[EX Q]: Question: A binary molecular compound is made up of two of what? Answer: elements
[EX A]: A binary molecular compound is made up of two  elements.

[EX Q]: Question: What is the center of an earthquake called? Answer: the epicenter
[EX A]:
The epicenter is the center of an earthquake called.

