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: Zero is the net force acting on an object when two equal forces are applied from opposite directions.

SOLUTION: What is the net force acting on an object when two equal forces are applied from opposite directions?

PROBLEM: Some of the giant fairy rings are produced by mycelia.

SOLUTION:
What are some of the giant fairy rings produced by?