TASK DEFINITION: Given scientific fact as input, generate the question from this fact such that it can be answered from the input.
PROBLEM: Potential energy type of energy is possessed by autumn leaves before they fall.

SOLUTION: What type of energy is possessed by autumn leaves before they fall?

PROBLEM: A theory is another name for a broad explanation that is supported by a great deal of evidence.

SOLUTION: What is another name for a broad explanation that is supported by a great deal of evidence?

PROBLEM: Group 16 is called the oxygen group.

SOLUTION:
Group 16 is called what?